Last week I replaced an RP that cracked in December for a customer. He forgot to shut the water off. Problem is it is located between 2 window wells and it flooded his basement. $12,00 to repair, for the SECOND time. He did the same 3 years ago. So I'm thinking of putting in a master valve in the basement at the point-of-connection, before the backflow preventer. Anyone have problems with MVs before the BF? And what kind of valve have you used for the MV? Only a couple companies use MVs here. One uses WeatherMatic, not sure what the other uses. At least this way if the BF cracks it wont spray water everywhere, flooding the basement, unless the controller turns on the MV.