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