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