Air admittance valves are mechanical devices that take the place of plumbing vents. They're inexpensive, they work, they can reduce the number of plumbing vent penetrations at the roof, they won't get ...
Better Homes and Gardens on MSN
Plan a Remodel with the Perfect Plumbing Vent Diagram
Learn why venting is important in a plumbing remodel and how to choose the best plumbing vent diagram for your space. When ...
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