Vent 22 also includes a generally disk shaped area 44 of {HEAD ~ flask top} 16 for {TAIL ~ interconnection} with valve 46 
for
Vent 22 also includes a generally disk shaped area 44 of { HEAD ~ flask top } 16 for { TAIL ~ interconnection } with valve 46
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH