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down spout from mainfloor bathroom is in front BWV, but i think you answered my question Thanks

am i allowed to place a valve behind a grey water drain for upstairsdrain adding new bathroom downstairs . (split entrance, sewage drain on basement floor) putting false floor to run plumbing would like to be sure??

as you may be able to tell I am a junior member, and am not sure where to ask a question ?? But here go,s a Backwater valve can it be placed behind a grey water down drain , I live in a split entrance and the drain is above the floor.