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This model is dedicated to electric water heater and is installed at the cold water inlet of electric water heater. It mainly plays the functions of check back and pressure relief to prevent the hot water in the electric water heater from flowing back into the cold water pipe, and can drain out the increasing pressure in the electric water heater as the water temperature increases, so as to ensure the normal use of the inner container, improve the service life of the inner container and avoid the rupture of the inner container.

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