The coupling comprises {HEAD ~ a housing} having a first end, {TAIL ~ a second end} and a body 
The coupling comprises { HEAD ~ a housing } having a first end , { TAIL ~ a second end } and a body
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH