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