The Watts 1/2” 9D-M3 BackFlow Preventer Valve with Atmospheric Vent is a high-quality valve designed for preventing backflow in water systems. This unit, made by Watts in the United States, features a spring-operated valve with a 1/2" female NPT pipe size. It also includes an atmospheric vent for additional protection. With a focus on durability and functionality, this backflow preventer valve is a reliable solution for industrial and commercial plumbing applications. Item weight is 1 pound, and 1.4 ounces. Free shipping to the lower 48.