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