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By the way vkristof@optonline.net told me in email that he went ahead and built it and the air admittance valve worked fine. He suggests maybe the box is not tight enough to allow the compression to be a problem. So at this point I am really only concerned about keeping down the stink, and...

basement laundry & utility sink vents I am planning to put laundry and sink to the basement. What is the simple solution for this pump box problem? If you only have relatively clean water waste I think you don't need a P trap on the sink or anything hooked up to the box vent, just pump to a...