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Old 04-09-2007, 05:19 PM   #2
tattoobob
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Join Date: Jan 2004
Location: Billerica, Ma.
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That is the backflow preventer on your boiler, if the unions are the same size you should be able to just unscrew and swap it out. can you take a pick of it so I can see what you have and can help a little better

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