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