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