{HEAD ~ A duct joiner} for connecting an air duct to another duct or other part of {TAIL ~ an air conditioning system} has a tubular neck portion, a retaining clip and a sealing ring both mounted on the neck portion 
{ HEAD ~ A duct joiner } for connecting an air duct to another duct or other part of { TAIL ~ an air conditioning system } has a tubular neck portion , a retaining clip and a sealing ring both mounted on the neck portion
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