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Series 9D dual check valves with intermediate atmospheric vent prevent the reverse flow of hot or cold Polluted water from entering into the potable water supply. It consists of a Brass body with stainless steel internal parts integral strainer and two durable tight-sealing rubber check valves. Series 9D is designed for continuous pressure non-health hazard applications in smaller supply lines such as laboratory equipment processing tanks sterilizers dairy equipment and specifically for boiler feed lines. Minimum working pressure: 25psi 172kPa maximum working pressure: 175psi 12.1 bar. made in United States. Manufactured by Watts regulator company.