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