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