The closure of tapered slits 2 insures that no air passes through the opening 70 of {HEAD ~ cap} 17 and through valve body 1 into {TAIL ~ passage} 11 
The closure of tapered slits 2 insures that no air passes through the opening 70 of { HEAD ~ cap } 17 and through valve body 1 into { TAIL ~ passage } 11
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH