In these arrangements, the threaded collar may further include a tubular body with a hollow interior to permit {HEAD ~ fluid flow} though {TAIL ~ the collar} 
though
In these arrangements , the threaded collar may further include a tubular body with a hollow interior to permit { HEAD ~ fluid flow } though { TAIL ~ the collar }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL