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