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Gravity Circulation Checks and Non-Return Valves for sanitary and HVAC (heating, venting and air-conditioning) applications Types: SBO to prevent gravity circulation RK70 especially suited for heating and hot-water installations. RK71 for liquids, gases, vapours. Application as gravity circulation check, vacuum breaker, breather, foot valve, pressure-relief valve or pressure-maintaining valve. MB14 for liquids, gases, vapours. Application as gravity circulation check, vacuum breaker, breather, foot valve, pressure-relief valve or pressure-maintaining valve.
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