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