in the following detailed description of drawings , the same reference numeral will be used to identify the same element in each of the figures . referring to fig1 , 9 a , and 9 b there is depicted a joint 20 in accordance with the present invention . the joint 20 defines a central conduit 22 having a central axis 24 about which the joint 20 is cylindrical . the joint 20 could be used with any fluid that can flow through the conduit 22 , particularly for high flow conditions that require the joint 20 to be adaptable to a number of different coupling threads . such a joint 20 is suitable for use in fire equipment to join connectors , which mate to adjacent pieces of fire equipment . the joint 20 includes a port 26 , a male joint half 28 , a female joint half 30 , a bearing strip 32 , a seal 34 , a gasket 36 , and a lug 38 . the port 26 can be manufactured as integral as part of any type of fire equipment such as pumps , hydrants , hoses , pipes , nozzles , and monitors . all of these pieces of fire equipment must be joined to an adjacent piece of fire equipment to form a continuous conduit from a firefighting fluid source to the tip of a nozzle ( not depicted ) that directs firefighting fluid toward a fire or other hazard . firefighting fluids include water , foam concentrate , foam , and others that are generally at high pressure while in the waterway 22 . it is noted that port 26 could be an inlet or an outlet . there is no distinction between the two for purposes of describing the invention , how it operates , or is manufactured . preferably , the port 26 includes the male joint half 28 , although a female joint half 30 could be joined to the port 26 . the male joint half 28 defines the central conduit 22 and typically has a generally smooth cylindrical outer surface 40 . in the outer surface 40 there is defined a radially outwardly open channel 42 . the outward open channel 42 can have any cross - sectional shape , but a generally v - shaped channel as depicted is preferred . the channel 42 can be machined into the male joint half 28 or formed into it when it is cast . typically , the male joint half 28 will be made of cast or wrought aluminum , but other materials can be used as well . at the extreme distal end of the male joint half 28 , there is an annular recess 44 into which the seal 34 is disposed . the seal 34 has a generally v - shaped cross - section to permit substantial resiliency and compression of the seal 34 for a fluid - tight connection . a suitable seal 34 is made of nitrile rubber of 80 durometer on scale shore a , or available as buna - n compound no . 3847 , available from precision associates inc . of minneapolis minn . the female joint half 30 is generally cylindrical about the central axis 24 of the waterway 22 . on its inner surface 50 , there is machined or cast a radially inwardly open channel 52 that opposes the radially outwardly open channel 42 of the male joint half 28 to define an annular groove 54 when the two joint halves are assembled . the inwardly open channel 52 can be any shape in cross - section , but it preferably has the same shape as the outwardly open channel 42 of the male joint half 28 . in the illustrated example , the channels 42 and 52 are generally v - shaped , which makes the resulting annular groove 54 generally diamond - shaped . as viewed in fig1 female joint half 30 also includes a tangential hole 74 and a hole cover 76 . the female joint half 30 of fig1 and 2 includes an inwardly extending radial wall 70 that is broad enough to engage the seal 34 , but narrow enough to avoid interference with the waterway 22 . the wall may include a slight step 77 ( see : fig2 ) to further improve contact with seal 34 . the female joint half 30 also includes a fire connector 70 which is depicted in fig2 as a female threaded connector 59 , but it could be made as male threads , one half of a quick connector , or as an androgynous connector . any number of female joint halves 30 can be manufactured with all types of connectors , threads , or sizes and inventoried so that the resulting joint 20 can be quickly made to accommodate any connector specified by a customer . this reduces the need to make and inventory equipment with standard threaded connectors built integrally into the equipment . female threaded connectors 59 generally have a gasket 36 that rests against the radial wall 56 to provide a watertight seal when the female threads 59 are connected to a mating piece of fire equipment . extending outwardly from the female joint half 30 is a lug 38 that is used to tighten the threads 59 to a mating connector piece ( not illustrated ). the lug 38 may be capable of hand tightening or it may be tightened by a tool such as a spanner wrench . the joint 20 depicted in fig1 , 9 a , and 9 b is designed to permit swiveling of the female joint half 30 relative to the male joint half 28 , but a locking key 60 ( fig1 and 3 ) can be inserted into a mating recess 66 to prevent swiveling as described more fully below . [ 0048 ] fig3 depicts a cross - section of a joint 200 that is prevented from swiveling by the locking key 60 . the female joint half 230 is nearly the same the same as that depicted in fig2 except that the female connector half is labeled 270 . in this embodiment , a push ring 235 is used to restrain the rotational position of the joint 200 to a set position when female threaded connector 270 is tightened down against the threads of a related piece of equipment . a push ring 235 in this device is essentially an aluminum washer that establishes a friction fit as the threads are tightened down during assembly of the connector threads 59 . an o - ring 250 prevents leakage around the push ring 235 . rotation of joint 200 is shown configured as locked because a locking key 60 in the form of a ball mutually engages both the keyway 66 and a slot 69 in the female connector half 230 . omission of the key ball 60 configures the joint 200 in a swiveling manner , as in fig2 but the push ring 235 , can be used to prevent swiveling after a related piece of equipment is threaded into the female threaded connector 59 . [ 0050 ] fig4 depicts a cross - section of a joint 300 that can also be tightened down on the threads 59 to fix the joint 200 in a desired orientation , but there is no locking key as was used in the fig3 embodiment . the male joint half 358 is nearly the same as that depicted in fig1 , and 3 except that there is no annular recess or seal at the distal end of the connector half . the female joint half 330 has an inwardly open channel 62 that mates with the outwardly open channel 42 of the male joint half 358 to define an annular groove 64 , but there is no radial wall for a seal . instead , there is simply a gasket 36 that bears on the end of the male connector half 358 . the threads 59 and lug 38 are essentially as described above in reference to fig2 . in fig5 the female joint half 220 includes a second joint half 225 which is depicted as a female joint half 225 of identical size to define a double - female swivel adaptor 500 . this is useful for joining pieces of fire equipment with male joint halves 28 together with a swiveling joint as in the case of an elbow joined to a valve . second joint half 225 could also be a larger or smaller size , or made in the opposite gender , in the same way double female joint halves of identical or differing sizes could also be made . all of the joints 20 , 200 , 300 , and 500 include a bearing strip 32 disposed in the annular grooves 54 . ( fig2 , 4 , and 5 ) the bearing strip 32 preferably has a shape that is generally the same as the annular groove . in the depicted examples , the bearing strip 32 is generally diamond - shaped in cross - section . in fig6 the cross - section of the bearing strip 32 and channels 42 , 62 are enlarged to depict more clearly how the preferred cross - section of bearing strip 32 is sized relative to the cross - section of the annular channels 42 and 52 , so that the bearing strip 32 effectively prevents contact between the two joint halves . by maintaining a clearance 99 between the two joint halves and manufacturing the bearing strip 32 out of a dielectric material such as nylon , there is a reduction in galvanic corrosion and electrical conductivity through the joint 20 , 200 , 220 and 300 , and double female swivel adaptor 500 . this increases the effective life of the joint . by using the preferred diamond - shaped cross - section for the bearing strip 32 , an efficient transfer of axial loads is accomplished . high - pressure fluids in the waterway 22 tend to force mating connector halves apart . to resist these forces , which are particularly high in fire equipment , the bearing strip 32 must have sufficient shear and bearing capacity , and it must be able to transfer the load from one coupling to the other . the preferred bearing strip 32 is made of dupont zytel ® nylon grade 101l bkb009 available from ashland distribution co ., in dublin , ohio , and has a dimension of 0 . 291 +/− 0 . 002 of an inch between flank 78 and flank 80 . the opposite two flanks are similarly dimensioned . the bearing strip 32 also preferably has flattened corners 70 , 72 , which measure about 0 . 07 of an inch . this is allows the tangential hole 74 to be kept to a minimal size . the annular channels 42 and 52 are preferably machined in aluminum and have their roots 75 rounded to an eighth of an inch radius to reduce stress concentrations . rounded crests 76 and 77 of the bearing strip 32 are made to a corresponding size . this combination of dimensions allows the bearing strip 32 to maintain clearance 99 of about 0 . 035 inch per side between the male joint half 28 and the female joint half 30 . depicted in fig7 and 8 are a plan view of the bearing strip 32 above ( fig7 ) and a bearing strip 32 disposed in a female connector half 28 ( fig8 ). as illustrated , the bearing strip 32 can be seen to fill a substantial portion of the annular groove 54 , but the bearing strip 32 preferably does not form a complete ring . it is not necessary for the strength of the joint , and it provides a convenient way to assemble and disassemble the joint . to assemble the joints described herein , the male and female connector halves are assembled and the bearing strip 32 is fed through the tangential hole 74 that extends from the annular groove 52 . the bearing strip 32 is flexible enough to be fed through the relatively straight tangential hole 74 and regain its shape as it moves through the annular groove 52 by virtue of being made from a flexible material . another example of a flexible bearing strip 32 is one using one or more cutouts 111 that reduce localized cross - sectional area of the bearing strip 32 to provide flex points that act as “ living hinges .” once installed , the bearing strip 32 preferably defines a gap 83 between its ends of about 26 degrees , but other gap dimensions up to and including 90 ° are sufficient to maintain the two connector halves together . it is also possible to use a multi - piece bearing strip , if desired . when multiple bearing strips are used , the total gap dimension between bearing strips can equal 90 ° or less . the bearing strip 32 is illustrated as a simple strip that is installed through the tangential hole 74 , but other embodiments are possible and within the scope of the present invention . for example , the strip could be “ injection molded ” by injecting plastic through a hole and allowing it to solidify in place . small segments of a bearing strip could be inserted through a rectangular hole one at a time until a desired number are positioned in the annular groove 52 . the assembly of the joint takes place at the manufacturing facility after a given piece of fire equipment has been ordered and a connector type and size is specified . the piece of fire equipment is pulled from inventory , as is a joint half with the specified connector type . the joint halves are then assembled and the bearing strip installed . once the joint is assembled , it is only necessary for the end - user to operate the connector in the same manner as previously known . thus , the joint does not affect the end - user &# 39 ; s operation of the equipment , but the manufacturer has reduced the inventory requirements for that piece of equipment . to disassemble the joint , a tool with a hook ( not depicted ) is fed through the tangential groove 86 to engage a hook 92 in one end of the bearing strip 32 . the tool can thus be used to pull the bearing strip 32 out of the annular groove 52 to permit the male and female couplings to be disassembled . disassembly may be necessary for repair , maintenance , or even to change the connector type on a given piece of fire equipment . as indicated above , the joint 200 of fig3 is not intended to swivel . the male joint half 28 includes a key 66 into which key ball 60 preferably made of annealed type 303 stainless steel can be inserted to engage a slot 69 in the female joint half 230 and occupy a portion of the gap 83 in bearing strip 32 . this prevents the female joint half 230 from swiveling relative to the bearing strip 32 and the male joint half 28 . although depicted as including a key ball 60 , the key 66 can be any suitable shape and configuration of components . in a similar way , this method can be used on any other joint in accordance with the present invention . the foregoing detailed description of the drawings is intended for clearness of understanding of the invention , and no unnecessary limitations therefrom should be read into the following claims .