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