Backflow Reference Manual - Conbraco/Apollo

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4V-500 / PVB / PVB-4V


1/2", 3/4", 1", 1 1/4", 1 1/2", 2"


This is a pressure vacuum breaker assembly. Production began in 1998 and was discontinued around 2010. Both model numbers have been used to designate this assembly. It is a bronze bodied unit. The air inlet incorporated a relief valve to protect the assembly from damage when the assembly is subjected to freezing. The check spring is contained when the bonnet is removed. The check seat is replaceable. The 1/2"-1 1/2" size check assembly is modular in construction and not field repairable. It must be replaced as a whole module. The 2" size does not have a modular check and can be repaired separately.


Common repair parts are a very small subset of the 10,000 plus items BAVCO stocks. Please feel free to contact us direct at 800-458-3492 for pricing on items not listed or backflow prevention devices.