Backflow preventers are devices installed in plumbing systems to prevent the reverse flow of water, which could contaminate the potable water supply. There are several types of backflow preventers, each designed for different applications and levels of hazard. An atmospheric vacuum breaker (AVB) is the simplest type, consisting of a float check valve that opens to atmosphere when the water pressure drops, preventing back-siphonage. AVBs are typically installed on lawn sprinklers and other non-continuous pressure applications....
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