{HEAD ~ A pressure release opening} in the seal cover is in {TAIL ~ fluid communication} with the circumferential passage 
is in
{ HEAD ~ A pressure release opening } in the seal cover is in { TAIL ~ fluid communication } with the circumferential passage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH