{HEAD ~ Application} of external pressure through {TAIL ~ the inlet port} causes at least a portion of the valve member to resiliently deflect away from the valve seat to thereby open the valve and permit fluid communication with the fluid tight volume 
through
{ HEAD ~ Application } of external pressure through { TAIL ~ the inlet port } causes at least a portion of the valve member to resiliently deflect away from the valve seat to thereby open the valve and permit fluid communication with the fluid tight volume
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL 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