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All Bronze body for durability. One check valve and an air opening for in one assembly Lightweight poppet seals air opening under minimum flow conditions Simple service procedures. All internal parts Serviceable in line from the top of the unit Designed for minimum head loss Features 0.75 in. 765 pressure vacuum breaker. Used to protect against health hazard non-health hazard backsiphonage conditions for lawn sprinkler irrigation systems. Swimming pools. Laundries industrial plants. All bronze body for durability with 1 check valve an air opening in on assembly. Lightweight poppet seals air opening under minimum flow conditions. All internal parts serviceable in line from top of unit. Designed for minimal head loss. Engineered plastic bonnet protects valve body form freeze damage. To repair damaged bonnet poppett use true value bobbet poppett repair kit febco no.953422. Pressure vacuum breaker assemblies should be installed at least 12 in. Above the highest piping outlet downstream of the assembly to preclude backpressure. Assemblies should be installed so they are easily accessible for maintenance periodic tests. Dimension – 8.9 l x 7.5 w x 3.5 h in. Item weight – 3.4 lbs.