The joiner may have one or more other neck portions with respective retaining clips and {HEAD ~ sealing rings} for joining {TAIL ~ one duct} to one or more other ducts 
for joining
The joiner may have one or more other neck portions with respective retaining clips and { HEAD ~ sealing rings } for joining { TAIL ~ one duct } to one or more other ducts
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH