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