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