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