1" Febco 765 PVB Features and Benefits The FEBCO 765 PVB is designed to be installed to provide protection against back siphonage of toxic or non-toxic liquids. It consists of a spring-loaded check valve which closes tightly when the pressure in the assembly drops below 1psi or when zero flow occurs, plus, an air relief valve that opens to break a siphon when the pressure in the assembly drops to 1psi. Maximum Working Pressure: 150psi (10.3 bar). Product Details All bronze body for durability. One check valve and an air opening port in one assembly. Lightweight poppet seals air opening under minimum flow conditions. Simple service procedures. All internal parts serviceable in line from the top of the unit. Designed for minimum head loss. Engineered plastic bonnet protect valve bodies from freeze damage. Optional union end ball valves for easy removal and ultimate freeze protection. End Connections NPT ANSI/ASME B1.20.1 1" Female pipe thread connection Pressure Vacuum Breaker Prevents back siphonage