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