{HEAD ~ The ridges} in {TAIL ~ the cylinder} engage the annular ridges on the plunger in a snap fit and prevent removal of the plunger from the cylinder after the syringe has been used 
in
{ HEAD ~ The ridges } in { TAIL ~ the cylinder } engage the annular ridges on the plunger in a snap fit and prevent removal of the plunger from the cylinder after the syringe has been used
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH