Backflow Reference Manual - Conbraco/Apollo

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4A-500 / PVB 4A / PVB 4ALF


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


The 4A-500 series is a pressure vacuum breaker assembly. Production began in 2008. The body is available in leaded or lead free (LF) bronze. There is a freeze protection relief valve mounted into the air inlet float assembly. The bonnet threads into the valve body. The internal parts are made of a glass filled PPO plastic and utilizes silicone discs. The check seat is replaceable.


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.