A valve body formed from {HEAD ~ a single piece} of {TAIL ~ pliable material} is mounted in the passage of the housing 
A valve body formed from { HEAD ~ a single piece } of { TAIL ~ pliable material } is mounted in the passage of the housing
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