Ensure reliable venting performance in tight spaces with this high-capacity Air Admittance Valve, rated for up to 6 Drainage Fixture Units (DFU). Engineered for low-flow fixtures like sinks and lavatories, this valve is the ideal solution when traditional roof or exterior wall venting isn't an option. Made from premium black ABS, it offers long-lasting durability and excellent resistance to corrosion. The included 2" x 1-1/2" threaded adapter provides added installation flexibility, making it a perfect fit for remodels, under-sink setups, or other confined plumbing applications. Eliminate the hassle and expense of roof penetrations while maintaining proper system ventilation and code compliance.