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