The cap includes a transverse top wall which is spaced from the top edge of the inner wall to provide {HEAD ~ an overflow path} for {TAIL ~ surges} of liquid and gas 
for
The cap includes a transverse top wall which is spaced from the top edge of the inner wall to provide { HEAD ~ an overflow path } for { TAIL ~ surges } of liquid and gas
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 REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH