A flexible elastic diaphragm extends across and is sealingly secured to {HEAD ~ the open top} of {TAIL ~ the hollow body member} which sealingly secures it thereagainst 
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A flexible elastic diaphragm extends across and is sealingly secured to { HEAD ~ the open top } of { TAIL ~ the hollow body member } which sealingly secures it thereagainst
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 TAIL OTH OTH OTH OTH OTH