RELIABLE SECONDARY VENTING SOLUTION: The Vent Check 2 is engineered for use as a secondary venting method in RV and mobile plumbing systems, ensuring proper airflow and reducing pressure buildup. 1-1/2" MALE THREADED DESIGN: Features a standard 1-1/2 inch male NPT thread for easy integration with existing plumbing setups, including compatibility with Schedule 40 ABS adapters. PATENTED SPRING MECHANISM: Built-in spring mechanism maintains a secure seal when not in use, preventing sewer gas backflow and promoting odor-free operation. PERFECT FOR RVs & COMPACT SPACES: Specially designed for recreational vehicles and other compact or mobile living environments where traditional venting isn't feasible. MANUFACTURED IN THE USA: Durable, long-lasting construction. Made with high-quality materials to withstand temperature variations, vibration, and long-term use in mobile environments. Certified by IAPMO, ANSI/NSF, ASSE 1050/1051, CSA. The Vent Chek 2 is a compact and efficient air admittance valve engineered for reliable performance in secondary venting systems. Specially designed for use in RVs, mobile homes, and other confined plumbing installations, this valve offers a smart solution where traditional venting is impractical. Thread Size: 1-1/2" Male NPT Application: Secondary venting in RV and mobile home systems Compatibility: Easily connects to Schedule 40 ABS adapters Patented Spring Mechanism: Ensures consistent seal support and prevents odor backflow Durability: Built for long-lasting use in rugged mobile environments Compact Design: Fits tight spaces while maintaining airflow and performance Whether you're upgrading or replacing, the Vent Chek 2 delivers dependable ventilation with minimal hassle, making it ideal for portable or space-limited plumbing setups.