The opening includes a cylindrical recess and {HEAD ~ four tapered slits} extending from the base of the recess to {TAIL ~ a point} shaped opening at the other side of said valve body 
extending to
The opening includes a cylindrical recess and { HEAD ~ four tapered slits } extending from the base of the recess to { TAIL ~ a point } shaped opening at the other side of said valve body
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH