{HEAD ~ A cover} is disposed over the membrane and is sealingly engaged with {TAIL ~ the body} to accommodate axial sliding movement from an outer position to an inwardly displaced position 
is sealingly engaged with
{ HEAD ~ A cover } is disposed over the membrane and is sealingly engaged with { TAIL ~ the body } to accommodate axial sliding movement from an outer position to an inwardly displaced position
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH 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