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