the detailed descriptions set forth below in connection with the appended drawings are intended as a description of presently - preferred embodiments of the invention , and is not intended to represent the only forms in which the present invention may be constructed and / or utilized . the descriptions set forth the structure and the sequence of steps for constructing and operating the invention in connection with the illustrated embodiments . it is to be understood , however , that the same or equivalent structures and steps may be accomplished by different embodiments that are also intended to be encompassed within the spirit and scope of the invention . referring to fig1 - 13 , the first - preferred embodiment of the present invention will be described . primarily referring to fig2 , 3 , the present embodiment petcock valve includes a main body or housing 20 including a screen filter 22 , an inlet section 26 , and an outlet section 24 extending orthogonally from the main body or housing 20 , all with generally hollowed - out interiors . optionally , the present embodiment may include an inlet extension 28 , a large spring 30 and elongate screen filter 32 . the inlet section 26 includes an inlet port 34 and a reserve port 36 . inside the main body or housing 20 is a main chamber or cavity 38 , the shape and configuration of which will be described in detail below . the top of the outside of the main body or housing 20 includes left hand threads 40 that engage the left hand threads ( not shown ) found on the bottom inside of a nut 42 , and in combination with a washer 44 secure the upper part of the petcock assembly together . the outlet portion 24 includes a nipple 46 that engages a conventional 5 / 16 inch diameter hose ( not shown ) to the motorcycle engine . the outlet portion 24 is available in other nipple 46 sizes for larger or smaller diameter hoses . also , rather than the right angle , 90 degree outlet port 24 , a straight outlet port ( not shown ) is also available . primarily referring to fig2 , the lower part of the petcock assembly may be described . a generally cylindrically - shaped selector handle 50 with rounded edges projects from an end flange or cap 52 . on the upper surface of the end flange 52 is a small pin 54 , the function of which will be addressed below . above the end cap 52 is a piston 56 of varying diameters and having a number of orifices or ports . the piston or rotor 56 is generally a cylindrical tube open on one end , with an inlet neck 58 , an inlet port 60 , a reserve port 62 and four ( 4 ) outlet ports 64 . just above the reserve inlet port 60 is a groove for a snap lock ring 70 , and just below the outlet ports 64 is a groove 68 for an o - ring 72 . a small spring 74 is seated inside the piston or rotor 56 between two of the outlet ports 64 and a pair of balls 76 are seated in those outlet ports and inside the main chamber or cavity 38 . now also referring to fig4 - 10 , the petcock valve may be further described . fig4 , 5 show the petcock valve in the “ off ” position , with the handle 50 rotated 180 degrees relative the outlet section 24 , such that the balls 76 are also in that line . as best shown in fig1 , the main body or housing 20 is made with a pair of shoulders or steps 82 , 84 to act as a stop for the location of the outlet section 26 and such that a space is created to retain an o - ring 86 . when the handle 50 and piston or rotor 56 are in this “ off ” position the balls 76 are pushed apart by the spring 74 such that the one ball 76 seats in the outlet port 64 and against the o - ring 86 , creating a highly effective seal and preventing any fuel from passing . also note the o - ring 72 that prevents fuel from passing between the piston or rotor 56 and main body of housing 20 ( see fig4 ). fig6 , 7 show the petcock valve in the “ reserve ” position with the selector handle 50 rotated 90 degrees counterclockwise from the “ off ” position . as shown by the arrows , fuel may flow through the aligned reserve ports 36 , 62 , into the inlet neck 58 and through the outlet port 64 , and into the outlet section 24 and the attached hose ( not shown ). finally , fig8 , 9 show the valve in the “ on ” position with the selector handle 50 rotated clockwise . again as shown by the arrows , the fuel may flow in through the inlet port 60 and into the inlet neck 58 and through the outlet port 64 into the outlet section 24 and out . now also referring to fig1 , 11 , other details of the main chamber or cavity 34 can be described . it is made with a circumferential , curved slot 80 for encapsulating the balls 70 inside the main body or housing 20 and generally inside the two select outlet ports 64 . further , as best shown in fig6 , the outlet section 24 is in fluid communication with the main chamber or cavity 34 by a hole bored therein . this hole also allows the ball 76 to travel further outboard under forces of the spring 74 and seat against the o - ring 86 as described above in conjunction with fig1 . additionally , around the inside of the main chamber or cavity 34 , at 90 , 180 and 270 degrees from the outlet section 24 , machined into the circumferential slot 80 are three vertical , curved slots 88 . the curve of the slots 88 approximately matches the curve of the balls 76 , being greater than the curve of the slot 80 . these slots 88 similarly allow the balls 76 to move slightly outboard at these positions , which tends to retain the valve in those positions until sufficient rotary force is applied to the selector handle 50 to force the balls 76 inward and into the circumferential slot 80 . additionally , as the selector handle 50 is being rotated between the “ on ”, “ off ” and “ reserve ” positions , the user feels in his fingers and hears a “ click ” sound as the balls 76 jump into the vertical slots 88 and / or against the o - ring 86 . referring to fig1 , yet another feature of the first - preferred embodiment of the present invention may be described . on the bottom side of the main body or housing 20 is a semi - circular slot 90 . this slot 90 is sized to receive the fixed , small pin 54 protruding from the top side of the flange 52 , that serves to limit rotation of the valve and handle 50 to 180 degrees . thus , when the user rotates the valve all the way counterclockwise it will be in the “ reserve ” position , whereas when rotated all the way clockwise it will be in the “ on ” position . referring to fig1 , 13 , the first - preferred embodiment of the present invention are shown installed in a pair of fuel tanks , in fig1 into a larger tank or deeper section of the tank , and in fig1 into a smaller tank or shallower section of the tank . on the top inside portion of the nut 42 are right - hand threads which engage a mounting bracket 92 the bottom of the fuel tank . the plastic washer 44 serves to prevent fuel from leaking outside the valve . the overall height of the petcock valve without the inlet extension 28 and not counting the screen filter 22 or 32 is less than about 2 . 25 inches . the screen filter 22 , 32 material is preferably a metal or metal alloy suitable for use in gasoline or other fuel environments . the mesh size of the screen 22 , 32 should be chosen for the particular application , to provide the filtering function without overly restricting the flow through of fuel from the tank into the engine , e . g . providing at least 70 ounces per minute . the other parts of the petcock valve are machined from 360 solid brass and show - chromed for a lifetime shiny finish . the o - ring 86 provides a no leak seal through the outlet 24 of the petcock valve , while the o - ring 72 prevents fuel from leaking out the bottom . the petcock valve is also easily uninstalled and disassembled for occasional maintenance . the nut 42 is loosened and the petcock valve removed from the fuel tank , such that the screen filter 22 , 32 can be removed and cleaned . then , if necessary , to service the o - rings 72 , 86 , the snap lock ring 70 is removed from the inlet neck 58 such that the piston 58 can be pulled through the inlet port 34 and separated from the main body or housing 20 . this will also release the balls 74 and spring 76 and thus care should be taken that those parts are not lost upon disassembly . the petcock valve is reassembled and reinstalled by reversing the above steps . referring to fig1 - 26 , the second - preferred embodiment of the present invention will be described . first primarily referring to fig1 , 17 , the second - embodiment petcock valve includes a main body or housing 120 , an end cap 122 and a selector handle 124 . the end cap 122 includes three ( 3 ) ports 126 , two outlet sections and an inlet section , each having a nipple 128 sized to engage a conventional 5 / 16 inch diameter hose ( not shown ) to the gas tank ( s ) or carburetor . the ports 126 ( or inlet / outlet sections ) are available in other sizes as needed , and a 90 degrees port is also available in addition to the straight line ports 126 shown . four ( 4 ) conventional fasteners 134 hold the end cap 122 onto the main body or housing 120 . now also referring to fig1 - 20 , further parts and components of the second - preferred embodiment valve may be described . inside the hollowed - out main body or housing 120 is a valve stem or rotor assembly 140 including a pivot pin 142 and a swing arm 144 . as best shown in fig1 , the pivot pin 142 and swing arm 144 are secured together by a retaining pin 146 so that they cannot rotate relative one another . the swing arm 144 has a longitudinal through hole that houses a compression spring 148 and a pair of balls 150 at each end . still further included are a number of o - rings , 152 in a circumferential groove in the pivot pin 142 , and 154 seated in the three ( 3 ) ports 126 and a large o - ring 156 around a raised land 158 on the inside of the end cap 122 . the pivot pin 142 includes a pair of holes 168 that are approximately 180 degrees apart from one another , and the selector handle 124 includes a similarly - sized hole to receive a conventional fastener 170 to fixedly attach the valve stem 140 to the handle 124 . note that this allows the selector handle 124 to be installed pointed up or pointed down as preferred by the user . referring to fig2 , 23 further details and features of the main body or housing 120 and end cap 122 may be described . in the raised land 158 of the end cap 122 is a cylindrical shaped cavity 160 sized to receive the forward end of the pivot pin 142 although allowing a small clearance between . similarly in the main body or housing 120 is a through hole 161 for the opposing end of the piston pin 142 and its connection with the handle selector handle 124 . inside the main body or housing 120 are a set of three ( 3 ) bowl - shaped indentations 162 each sized to receive the ball 150 . referring to fig2 , the end cap 122 is machined to include a shoulder 164 in combination with port 126 including a stop 166 , such that each port 126 can only be pushed in so far thereby creating a space for encapsulating and retaining the o - ring 156 . now also referring to fig2 a - 21c and 24 - 26 , the operation , function and use of the valve of the second - preferred embodiment will be discussed . the handle 124 and valve stem or rotor assembly 140 revolve up to approximately 180 degrees inside the main body or housing 120 to one of three ( 3 ) positions , tank 1 , carburetor or tank 2 . when the swing arm 140 is rotated over the tank 1 port 126 as shown in fig2 a , the ball 150 seats against the o - ring 154 thereby preventing fuel from flowing in from the tank 1 ( see also fig2 , 26 ) while fuel flows freely from tank 2 to the carburetor . the tank 1 port 126 may be connected by a flexible hose ( not shown ) to the main portion of the gas tank ( usually called the “ on ” position ) while the tank 2 port 126 may be connected to the bottom or reserve portion of the tank ( called the “ reserve ” position ), or vice versa , while the “ c ” port 126 is connected to the carburetor . similarly , when the handle 124 and swing arm 144 are rotated over the carburetor or tank 2 ports 126 ( fig2 b , c ), those ports 126 are closed and fuel flows between the other two open ports 126 . on the other side of the arm 144 is a second ball 150 that sits between the compression spring 148 and the inside surface of the main body or housing 120 . as the handle 124 and valve stem 140 are rotated between the three positions described above , this other ball 150 travels between the three bowl - shaped indentations 162 . when the swing arm 144 is positioned over one of the ports , 126 , the compression spring 148 causes the ball 150 to jump into the indention 162 and lodge itself therein and create a “ click ” action ( see fig2 ). this indicates to the user that the handle 124 is properly positioned at one of the three positions , and tends to keep the handle 124 at that position until sufficient force is applied to turn the selector handle 124 and force the ball 150 out of the indention 162 ( along with the other ball 150 out of its seat on the o - ring 154 in the port 126 ) and back inside the swing arm 144 . additionally , the main body or housing 120 is configured such that at the tank 1 and tank 2 positions ( fig2 a , 211 c ) movement in only one direction is possible , so the user knows moving the selector handle 124 all the way one way is the “ on ” position while moving it all he way the opposite way is the “ reserve ” position . the pair of holes 136 in the end cap 122 are mounting means for conventional fasteners for securing the petcock assembly to a motorcycle frame ( not shown ). the petcock assembly is installed below the gas tank and above the carburetor , as the fuel system is gravity fed , and preferably with the two inlet ports above the single outlet port . referring to fig2 - 32 , the third - preferred embodiments of the present invention will be described . first primarily referring to fig2 - 29 , the present embodiment petcock valve includes a main body or housing 210 , a selector handle 212 , a pair of swivel inlet sections 214 and a fixed outlet section 216 , each of which are sized to accept a conventional fuel hose or line ( not shown ). the housing 210 includes four ( 4 ) threaded holes 218 sized to receive fasteners ( not shown ) to mount the housing 210 against a plate - like structure ( also not shown ) on the motorcycle or other vehicle . the housing 210 includes two ( 2 ) other smaller , tooling holes 220 used only in machining the housing 210 . note the slots 222 in the side of the housing 210 and large opening 223 in the bottom which facilitate access to the inside and the components therein for cleaning and maintenance purposes . now also referring to fig3 - 32 , the parts and components inside the housing 210 may be described . a rotary piston 224 includes a top or neck portion 226 that interfaces with the selector handle 212 through a hole 228 in the housing 210 , and a fastener hole 230 is sized to receive a fastener 232 to secure the rotary piston 224 and selector handle 212 together . upon assembly to prevent any fuel from leaking through the hole 228 in the housing 210 , the rotary piston 224 has a circumferential groove 234 sized to accept an o - ring 236 . a middle portion 238 of the rotary piston 224 has two orthogonal through bores that create three ( 3 ) ports 240 and a fourth port 241 ( which correspond to ports in the main body or housing 210 that lead to the inlet 14 and outlet 16 sections ). the port 241 aligned with the handle 224 is made a slightly larger diameter to accept a small spring 242 and a ball 244 . on the bottom of the rotary piston 224 is a pivot pin 246 , and beneath the rotary piston 224 is an end cap 248 with a cavity 250 sized to accept the pivot pin 246 . the end cap 248 has a circumferential groove 252 sized to accept an o - ring 254 that prevents fuel from leaking out the bottom opening 223 in the housing 210 . a locking ring 256 is used to secure the end cap 248 inside the housing 210 . each of the inlet sections 214 has three ( 3 ) circumferential groves 258 , two of which are for o - rings 260 that prevent fuel from leaking out the side of the housing 210 , and the last groove 258 for a lock ring 262 that retains the inlet section 214 inside the housing 210 , although the inlet sections 214 are still freely able to pivot ( 360 degrees ) to any desired position . there are three ( 3 ) additional o - rings 264 in small steps in the housing 210 adjacent the interface with the inlet 214 and outlet 216 sections . the outlet section 214 is preferably an interference press fit and permanently set into the housing 210 . having described the structure of the third - preferred embodiment , it is now possible to discuss its operation , function and use . the valve of the third - preferred embodiment is configured for the main body or housing 210 to be mounted to a generally flat , plate - like structure and secured with conventional fasteners ( not shown ) through the four ( 4 ) mounting holes 218 , and conventional hoses or fuel lines from a the gas or reserve tank or other fuel sources are attached to the inlet sections 214 . advantageously , the inlet sections 214 can freely pivot 360 degrees all the way around , providing great flexibility in the routing of the hoses or fuel lines thereto . that is , the inlet sections 214 can be positioned pointing forward as shown in the fig2 - 32 , or alternatively can individually or both be pivoted to point downward , backward , upward or anywhere in between , while being retained by the lock rings 262 . with the selector handle 212 in the position aligned with the outlet section 216 , the ball 244 is seated against the o - ring 264 in the step in the housing 210 adjacent the outlet section 216 and thus no fuel can flow through the outlet section 216 and to the carburetor or other destination ( not shown ) for the fuel . with the selector handle 212 aligned over either of the inlet sections 214 , the ball 244 similarly closes that inlet section 214 and allows fuel to flow only through the other inlet section and the rotary piston 224 and the outlet section 216 . with the ball 244 seated in any of the inlet 214 or outlet 216 section , as the user begins to turn the handle 212 this tends to force the ball 244 ( compressing the spring 242 ) inside the rotary piston 224 , and when it reaches the desired inlet 214 or outlet section 216 the ball 244 jumps ( the spring 242 is released from a compressed state ) into the seat provided by the o - ring 264 . this makes a clicking sound and is positive engagement of the selector handle 212 and valve in the new position , and the selector handle 212 and valve tend to stay in that position until forcibly moved to another position . disassembling of the third - preferred embodiment for cleaning , replacement of o - rings 236 , 254 , 260 or 264 , or the like is easily accomplished . the lock rings 256 or 262 are removable to gain access inside the housing 210 to every part and component of the petcock valve , and then merely reversing one &# 39 ; s steps to reassemble the valve . preferably in disassembling either of the inlet sections 214 , the selector handle 212 should be in the “ off ” position aligned with the outlet section 216 , such that the ball 244 will not be propelled out of the housing 210 and possibly lost . finally , referring to fig3 - 39 , the fourth - preferred embodiment may be described . initially primarily referring to fig3 , 34 , this valve has a main body or housing 310 defining a chamber or inner cavity 312 ( see fig3 ), and a pair of swiveling inlet sections 314 , 315 and a fixed outlet section 316 . on the ends of the inlet sections 314 and outlet section 316 are nipples 318 for connecting conventional fuel hoses ( not shown ). a selector or lever handle 320 connects to the inner workings of the valve , and an end cover 322 closes out the valve and also serves to provide an interface for a two - fastener mount to a flat surface ( not shown ). as best shown in fig3 , housed inside the chamber 312 is a two - stage rotor 324 having an upper portion 326 and a lower portion 328 and a rotor cap 330 . the inside of the chamber 312 also has a circumferential groove 332 between one or more seats 334 , the function of which is explained below . the bottom side of the main body 310 has a pair of protruding pins 336 and the interfacing side of the end cover 322 has a pair of corresponding holes 338 for mating these two parts together . the main body 310 and end cover 322 are secured together by four conventional fasteners 340 through the holes 342 , 344 . the rotor cap 330 has a protruding stop 346 that rides in the slot 348 in the end cover 322 . continuing to refer to fig3 and also fig3 , 39 , the top of the rotor 324 extends through an opening in the main body 310 and into an opening 350 in the selector handle 320 , and is fixedly connected to the handle 320 by a conventional fastener 352 through threaded holes 354 and 356 . a circumferential groove 358 in the rotor 324 houses an o - ring 360 to seal the top portion of the valve body 310 . sealing the bottom of the main body 310 is a second o - ring 362 that rides around the perimeter of a recessed area 364 in the end cover 322 . in that recessed area 364 there is also a spring washer 366 that maintains a sliding gap between the revolving rotor 324 and rotor cap 330 and fixed end cover 322 . a second protruding pin 368 and corresponding hole 370 are for tying the rotor 324 and rotor cap 330 so they revolve together . the rotor end cap 330 also includes a pivot pin 372 that rides in an opening 374 in the end cover 322 , and as shown in fig6 the pivot pin 372 extends on the upward side of the rotor cap 33 as well to fill the opening in the bottom of the rotor 324 . finally , the end cover 322 includes a pair of holes 386 for mounting to a flat surface ( not shown ). the side portions of the main body 310 include a stepped hole 378 sized to accept a tubular portion 380 of the inlet sections 314 , 315 . on the tubular portion 380 are a pair of circumferential grooves 382 for a pair of o - rings 384 , and a third circumferential groove 382 for a locking ring 386 that slides into a slot 388 in the side of the valve body 310 . this configuration and assembly secures the inlet sections 314 , 315 and seals the sides of the main body 310 while still allowing the inlet sections 314 , 315 to freely swivel in either direction . fig3 shows the inlet sections 314 , 315 swiveled to align with the outlet section , whereas fig3 , 34 show the inlet sections 314 , 315 swiveled to the opposite direction as the outlet section 316 . now also referring to fig3 , the inner workings of the valve can be described . the rotor 324 is in the approximate shape of a bowling pin and revolves inside the chamber 312 of the main body 310 . inside the rotor 324 is a passageway 390 including a pair of intersecting horizontal through holes in the lower portion 328 , a vertical hole through the bottom extending upwards past the intersecting through holes to a horizontal exit hole in the upper portion 326 of the rotor . a pair of balls 392 separated by a compression spring 394 and mounted in the lower portion 328 through hole that aligns with the through hole in the upper portion 326 . a curved vertical slot 396 is machined into the interior circumferential grove at three places . where the outlet section 316 meets the main body 310 a space is created to retain an o - ring 398 . see fig1 for an enlarged view of this same valve seat structure found in the first embodiment . the fourth embodiment operates as follows . the valve is mounted to a flat surface remote from the fuel supply and carburetor ( all not shown ), and fuel hoses ( not shown ) are connected to the valve . the inlet sections 314 , 315 freely swivel ( fig3 - 35 ) offering flexibility in routing of the fuel lines . when the selector handle 320 is in the “ off ” or middle position the balls 392 are seated against the o - ring 394 and in the vertical slot 396 180 degrees opposite , and the outlet section 316 is sealed and no fuel is able to pass through the valve . also while in the “ off ” position , the rotor 324 is oriented such that the hole in the upper portion 326 of the passageway 390 is misaligned with the inlet sections 314 , 315 such that no significant amount of fuel is able to pass into the valve from either of the inlet sections 314 , 315 . when the selector handle 320 is rotated 90 degrees counter - clockwise ( looking down at the top of the valve ), the rotor 324 revolves 90 degrees in the same direction , moving the ball out of the seat and away from the o - ring 398 and the upper portion 326 now being oriented such that the hole aligns with the inlet section 315 ( see , fig3 ). fuel is able to flow readily into the inlet section 315 , through the passageway 390 and out the outlet section 316 . if the handle is now rotated 180 degrees clockwise ( not shown ), fuel is able to enter through the other inlet section 314 and pass though the outlet section 316 . the valve is configured such that there is a hard stop at the two open or “ on ” positions , and a detent to indicate and hold the rotor / handle at the midway “ off position .” the fourth embodiment valve is also easily disassembled for maintenance purposes . the hoses ( not shown ) would be disconnected and the valve removed from the mounting surface ( not shown ). the inlet sections 314 , 315 are easily removable by sliding out the locking ring 396 . after the bottom fasteners 350 and end cover 322 are removed , as well as the handle fastener 352 and selector handle 320 , then the rotor cap 330 and rotor 324 , balls 392 and spring 394 can be removed from inside the body 310 . when removing the rotor 324 from inside the body 310 , one should put his or her hand around the rotor 324 to catch and avoid losing the loose balls 392 and spring 394 . this provides access to replace all the o - rings , e . g . 360 , 362 , 398 , etc . as well as for cleaning of the rotor 324 and chamber 312 inside the body 320 . merely reversing these steps will reassemble the valve . while the present invention has been described with regards to particular embodiments , it is recognized that additional variations of the present invention may be devised without departing from the inventive concept .