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McDonnell & Miller 310447 Series 14-B Ball Type Blow Down Valve Features and Benefits For McDonnell & Miller Series 47, 67 and 70B boiler control blow down valve replacement Full-ported ball action valve PTFE seats provide bind free, leak tight ball movement Easy open handle keeps hands away from hot water and steam Gasket and mounting screws included Maximum pressure 30 psi (1.8 kg/cm2)
