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Question: About a year ago a friend asked me about installing a water powered sump pump for him. I checked with the town and they require an expensive valve to insure there is no backflow between the pump and the water supply; if I remember correctly, there are two kinds that could be used, and they require the expensive one. Ultimately the friend decided not to do it, so I forgot about it. Today he called wanting it to go in before he goes on vacation Monday! It is a simple enough job, but I can't remember what the valve the town required was. An ideas?
Answer: -backflow valve. - http://www.irrigationtutorials.com/links/backflowmanf.htm -They probably require a reduced-pressure principle backflow preventer- The cheaper one is probably a double check valve with an atmospheric break-
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