... NF,JIS,JB,GB TypeProduct6mm-2000mm Foot Valve Intake in Water ProjectValve,Foot valve,Bottom valve,Flush bottom valvesSize6mm-2000mm(1/4″-80″)Nominal ... ,JIS,JB,GBApplicationwater, oil,air ,steam,etc Bottom valve is an energy-saving valve,which is usually installed in the pump suction ... at the bottom of the underwater to limit liquid ...