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