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A pressure-type vacuum breaker backflow prevention assembly consists of one check valve force loaded closed and an air inlet vent valve force loaded open to atmosphere, positioned downstream of the check valve and located between and including two tightly closing shutoff valves and test cocks.

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603.5.16 Water Supply and Distribution, Special Equipment
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or equipment-mounted vacuum breakers and faucets with integral atmospheric vacuum breakers or spillā€”resistant vacuum breaker assemblies shall be installed ...