{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, {TAIL ~ a retaining clip} and a sealing ring both mounted on the neck portion 
has
{ 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 , { TAIL ~ a retaining clip } and a sealing ring both mounted on the neck portion
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