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