Application of {TAIL ~ external pressure} through the inlet port causes {HEAD ~ 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 
Application of { TAIL ~ external pressure } through the inlet port causes { HEAD ~ 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
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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