An interference fit between cylindrical valve member 24b and valve seat 34 permits rotation of cylindrical valve member 24b within {HEAD ~ valve body 24a}, while providing {TAIL ~ a watertight seal therebetween} 
providing
An interference fit between cylindrical valve member 24b and valve seat 34 permits rotation of cylindrical valve member 24b within { HEAD ~ valve body 24a } , while providing { TAIL ~ a watertight seal therebetween }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL