Waste of money and time. Wondering if I have a few hundred or 1mm in the house. Will you rely on a cheap little source to protect your house from flooding? I recently installed one of these devices, hooked everything up and set it up. 1 hour exactly. turned on Small pressure reducing valve is leaking, on/off bypass mode didn't matter. Everywhere water flows from the air valve. Save your money and home, DO NOT buy this device. There was 1 star because zero was not an option.
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