The cap is sealingly secured against the body member so as to define {HEAD ~ a pressurizable cavity} in {TAIL ~ the hollow} between the cap and the diaphragm, and the cap having a rigid stem protruding therefrom with a fluid passage extending through the stem and into fluid communication with the cavity 
The cap is sealingly secured against the body member so as to define { HEAD ~ a pressurizable cavity } in { TAIL ~ the hollow } between the cap and the diaphragm , and the cap having a rigid stem protruding therefrom with a fluid passage extending through the stem and into fluid communication with the cavity
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 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 OTH OTH OTH OTH OTH