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