Do it Best 1-1/2 In. MIP Mechanical ABS Vent Valve

Eliminates expensive secondary vent stacks. Can be used for sinks, basins, tubs, showers, vanities, and washing machines – not to be used for toilets. 1-1/2″ Male pipe threads. Packed 1 per card. Each drainage system using a Mechanical vent must have a main vent stack to atmosphere (through the roof) located so as to vent the water closet. Do not install the mechanical vent in sealed wall cavity – install in a readily accessible location. Installation limited to structures not exceeding 2 stories in height and without corrosive water.

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer.