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Backflow preventer leak

617 Views 1 Reply 2 Participants Last post by  surferdude2
My boiler has a backflow preventer that is dripping pretty steadily from the downpipe.

I think I can manage a replacement, but just wanted to make sure I'm looking at the right part and that this is in fact the correct course of action, replacing this backflow preventer.

Is this a suitable replacement part?

And am I right in assuming this is a wrench job? I don't mind sweating pipes but it looks like I can maybe keep the existing threaded connections.

Side note: The leak started after I had to shut off the main supply to the house briefly. There was no leak before the shut-off, and after the water was turned back on, the backflow preventer was leaking. Why would a temporary shut-off of the main water supply trigger this leak?
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