referring first to fig1 , a sprayer device is shown including a handle assembly ( generally 10 ) for attachment to a canister assembly 13 . there is a canister housing 15 for receiving an aerosol can containing a pesticide , insecticide , agricultural chemical , or other chemical to be sprayed . the housing 15 includes a connecting portion 17 which is tubular in shape , and which is detachably connectable to the handle assembly 10 . as described below , the handle assembly can include a plurality of tubes 16 , 18 , and 19 . referring still to fig1 and now also to fig2 and 3 , a trigger assembly 12 is coupled to an actuator rod formed of multiple segments such as 31 , 22 , and 32 . rod portion 31 is coupled to the trigger assembly 12 and at the opposing end is sized and dimensioned to contact the next rod 22 . along the length of the rod 22 are positioned one or more disks 24 , each having a diameter sized and dimensioned to fit within the tubular segment 19 and to axially align the rod 22 . the actuator rod 22 extends axially through tube 19 such that the radially - extending flexible barbed end 26 extends beyond the end thereof . tube 18 has a narrowed end 25 sized and dimensioned to fit into tube segment 16 which has a similar narrowed end 20 . as shown in fig6 , narrowed end further includes a radial projection 28 . the radial projection 28 can be constructed of a flexible material , or can alternatively be constructed using springs or other elements which allow the projection 28 to retract . referring now also to fig5 , at a first end the tube segment 19 includes an aperture 30 sized and dimensioned to receive a projection 28 to lock the central tube segment 19 onto the trigger assembly . at the opposing end , the central tube segment 19 includes a narrowed end 25 which is sized and dimensioned to fit in tube segment 16 . a radial projection 48 is provided on the narrowed end 25 for receipt in the tube segment 16 . in the most preferred forms the distal end of one rod segment is slightly bowed outwardly and the adjacent end of the next rod segment is dished inwardly such that the rods easily mate when in contact . tube segment 16 includes a narrowed end 20 which is sized and dimensioned to be received in the tubular connector 17 of the canister housing 15 to provide a continuous shaft assembly 14 between the canister housing 15 and the trigger assembly 12 . the narrowed end 20 can include a projection 58 to be received in a mating aperture in the tubular connector 17 of the housing 15 . again , the projection 58 can be flexible to allow the projection 58 to be snapped into the aperture 60 to lock the adjacent tube segments together . a third axially moveable rod segment 32 is provided in the tube segment 16 , and preferably includes a depression at one end for receiving the distal end of the rod segment 22 , and a radially - extending flexible barbed end 56 at the opposing end . as described with reference to the axially moveable rod 22 , the rod 32 includes a plurality of disks 24 which can be formed integrally with the rod 32 or provided as separate washers . the disks 24 maintain the axially moveable rod 32 substantially centered within the tube segment 16 . the rod 32 is preferably longer than the tube segment 16 , such that the distal end of the rod 32 extends through the narrowed end 20 at the tube segment 16 and is positionable adjacent a spray actuator ( not shown ) adjacent the canister 15 to allow activation of the spray canister . the spraying device is assembled by mounting the central tube segment 19 over the actuator rod 22 onto the narrow end 27 of the tube segment 18 , and the aperture 30 aligns with the projection 28 such that the projection 28 is snap fit into the aperture 30 . the narrow end 25 including projection 48 is positioned at the open end . as the central tube segment 19 is moved over the barbed end 26 of the rod 22 , the flexible barbs flex inward . when the tube 19 is in position , the flexible barbs 26 flex outwardly extending radially beyond the outer diameter of the narrow end 25 of the tube segment 19 adjacent the barbs 26 , and therefore limiting motion of the rod 22 back into the tube segment 19 . to aid in positioning the central tube segment 19 over the rod 22 , alignment marks such as an arrow 29 can be provided along the edges of the tubes 18 and 19 . similarly , the tube segment 16 is positioned over the rod 32 . as the tube segment 16 is moved over the barbs 26 , the barbs flex inwardly , and then flex outwardly as they exit the tube segment 16 . the outwardly flexed barbs are provided adjacent the narrow end 20 , and therefore they limit movement of the rod 32 back into the tube segment 19 . when the tube segment 16 is in position , the tube segment 16 is positioned onto the narrow end 25 of the central tube segment 19 , such that the projection 48 is aligned with the aperture 50 to couple the central tube segment 18 to the central tube segment 19 . as assembled , the rod 32 is centrally aligned in the tube segment 16 , and the rod 22 in the tube segments 18 and 19 . to assemble the tube segment 16 onto the central tube segment 19 , the tube segment 16 is aligned with the central tube segment 19 , positioned over the narrow end 27 of the central tube segment 19 , and aligned such that the projection 58 aligns with the aperture 60 . the tube segment 16 can therefore be locked into position , and the rod 32 adjusted such that the distal end of the rod 22 extends into a mating depression in the rod 32 . the narrow end 20 of the tube segment 16 is then received in the tubular connector 17 in the canister 15 . when assembled , the rod 32 is adjacent a spray activator for activating the spray canister . when the trigger assembly 12 is activated , the rod 22 is forced axially forward toward the canister housing 15 , causing the rod 32 to contact the spray activator to cause activation of the canister . because the rods 22 and 32 are axially aligned in the tube segments 16 , 18 , and 19 by the rings 24 , the rod assembly can repeatably and reliably activate the spray canister . furthermore , the spray device can be disassembled during shipment or storage , and assembled when desired . in fig6 the projection 28 is alternatively shown as flat at a first end 62 and rounded at a second end 64 . extending from the flat end the projection is at a selected height up to an intermediate point 66 from which the projection tapers down toward the rounded end 14 . the mating aperture 30 also includes a flat end 68 and an opposing rounded end 70 for receiving the projection 28 . this makes the connection more solid . referring now also to fig7 in this embodiment the projection 28 is as described above with reference to fig6 , albeit axial slits 38 are provided on opposing sides of the projection . various alternative mechanical methods for attaching the actuator rod segments 22 and 32 ( e . g . threads ) will be apparent to those of skill in the art . additionally , while the invention has been described with reference to a spraying device , various other dispensers and cleaning apparatuses which require an internal rod and a tube could also be constructed using the described coupling device . although the assembly has been described above to include three separate tube segments 16 , 18 , and 19 , it will be apparent that various numbers of tube segments could be connected as described , and further that a fewer number of tube segments could also be used . for example , an assembly having only two tube segment can also be used . hence , various modifications of the above described embodiment may be made without departing from the spirit or scope of the following claims . thus , the claims should be looked to in order to assess the full scope of the invention . disclosed are structures for detachably coupling two tubes while simultaneously aligning and guiding an axially movable rod extending therein , such devices being suited for use with remote sprayers .