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