tube 110 112 the channel 194 fluidly communicates with the hub cannula 186 and the channel 196 fluidly communicates with the hub cannula 188 so that channels are formed through the length of the second portion 154 further the proximal end 184 of the proximal portion 154 includes projections 198 200 extending therefrom generally away from the channels 194 196 respectively the projections 198 200 are sized and disposed such that when the proximal end 158 of the distal portion 152 is disposed over the distal end 182 of the proximal portion 154 the projections 198 200 are received within the recesses 174 176 respectively the projections 198 200 are preferably generally orthogonally shaped however the proximal edge 198 a 200 a of each projection 198 200 is preferably slightly chamfered to allow the respective recess 174 176 to fit over the proximal edge 198 a 200 a the proximal end 158 of the distal portion 152 as well as the channel 160 are sized to allow the proximal end 158 of the distal portion 152 to be disposed over the distal end 182 of the distal portion 154 such that each cam 170 172 is engageable with a respective locking receiver 190 192 preferably the proximal end 184 of the proximal portion 154 is constructed from pellethane and the distal end 182 of the proximal portion 154 is constructed from tecoplast although those skilled in the art will recognize that both the proximal end 184 and the distal end 182 may be constructed from other suitable materials further the hub cannulae 186 188 are preferably constructed from 304 stainless steel although those skilled in the art will recognize that other.