Ensure proper plumbing ventilation with this Air Admittance Valve (AAV), designed for reliable performance in both residential and commercial applications. Constructed from durable PVC material, this valve features a 1-1/2 inch diameter inlet and a 2 inch diameter outlet, making it compatible with a wide range of drainage and venting systems. Engineered to meet strict ASSE 1050 and 1051 standards, along with ICC ESR-1664, NSF Standard 14, and IAPMO classified approvals, this AAV provides code-compliant performance you can trust. Built to handle demanding environments, it also conforms to ASTM D2665 and ASTM D2661 specifications for PVC drainage piping. The valve allows for efficient airflow and pressure balance in plumbing systems, preventing trap siphonage, gurgling, and sewer gas escape without requiring a traditional roof vent. Ideal for new installations or retrofits, this air admittance valve is a dependable solution for ensuring safe, efficient, and maintenance-free plumbing venting.