{TAIL ~ The top portion} 21 of {HEAD ~ the T shaped valve member} 20 forms a sealing surface 30 for selectively substantially preventing fluid flow through the opening 26 
{ TAIL ~ The top portion } 21 of { HEAD ~ the T shaped valve member } 20 forms a sealing surface 30 for selectively substantially preventing fluid flow through the opening 26
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH