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