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The Apollo(R) Model PVB4A and PVBLF4A Pressure Vacuum Breaker A Series prevents contamination
of the potable water supply due to back-siphonage. A standard integral freeze protection relief
valve serves to reduce the possibility of damage due to intermittent freezing conditions. The
modular check valve cartridge provides a captured spring, a replaceable seat, and a reversible
silicone seat disc. This Made in America assembly features ball valve shutoffs with stainless steel
handles and nuts as standard and carries the five-year Apollo(R) factory warranty.