In another preferred embodiment, {TAIL ~ the inlet port} is defined by {HEAD ~ a generally radial bore} in the first hub collar 
In another preferred embodiment , { TAIL ~ the inlet port } is defined by { HEAD ~ a generally radial bore } in the first hub collar
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH