Preferably, the annual chamber extends from the inlet port to {TAIL ~ an axially opposite end} of {HEAD ~ the first hub collar} 
Preferably , the annual chamber extends from the inlet port to { TAIL ~ an axially opposite end } of { HEAD ~ the first hub collar }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD