Watts 3/4 in. x 3/4 in. Brass FPT x FPT Anti-Siphon Air Admittance Valve

This anti-siphon vacuum breaker is an excellent choice for both homeowners and contractors. It is designed to prevent the back siphon-age of contaminated water from entering into the potable water supply. It is a superior choice for low flow non-continuous pressure installations. This vacuum breaker features bronze internal trim, a chemical resistant seat disc and an atmospheric vent to prevent spilling.