Jones Stephens Black MPT ABS Vent Valve, 1-1/2 in. is the solution for sinks, tubs, showers, vanities, and washing machines, eliminating the need for a secondary vent stack. Designed with 1-1/2-inch male pipe threads, this vent valve provides reliable performance in your drainage system. Please note, it is not suitable for use with toilets or in buildings taller than two stories or with corrosive water. To ensure proper function, the drainage system must include a main vent stack through the roof to vent the water closet. This ABS vent valve an efficient and cost-effective way to manage venting in your plumbing setup.