{HEAD ~ The ridges} on the cylinder snap fit into mating {TAIL ~ annular ridges} in the cap to prevent re use of the needle once the syringe is discarded 
{ HEAD ~ The ridges } on the cylinder snap fit into mating { TAIL ~ annular ridges } in the cap to prevent re use of the needle once the syringe is discarded
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH