The sealing ring has a ring section received in another groove in {HEAD ~ the outer surface} of the neck portion and a resilient skirt which provides a seal between the neck portion of {TAIL ~ the joiner} and the duct 
The sealing ring has a ring section received in another groove in { HEAD ~ the outer surface } of the neck portion and a resilient skirt which provides a seal between the neck portion of { TAIL ~ the joiner } and the duct
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH