The Apollo PVB4A 3/4" pressure vacuum breaker (model 4A504A2F) is a freeze-resistant backflow preventer designed for irrigation and potable water systems. Its bronze body and modular check cartridge provide reliable protection against back-siphonage while minimizing pressure loss. Size & connections: 3/4" FNPT x FNPT; compact 7-5/8" height for tight installations. Construction: Bronze body, captured stainless springs, and replaceable silicone seat disc. Performance: 150 psi maximum operating pressure; temperature rating approximately 33–140°F. Freeze protection: Built-in integral freeze relief valve to reduce freeze damage risk. Serviceability: Easily removable modular check cartridge and ball valve shutoffs with stainless handles. Approvals: Listed to common industry standards (ASSE, IAPMO, NSF/ANSI); see submittal for full listings. This assembly includes SAE threaded test cocks for draining and is suitable for vertical or horizontal installation. Download the installation manual (IOM) and submittal sheet for complete dimensions, warranty details, and installation guidance.
