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