99291731 Grundfos DDE Series Digital Dosing Pump, Type Key: DDA 200-4 AR-PVC/E/C-F-32A7A7BG. 3/4″ x 3/4″ NPT Male Connection, 100-240 Volts, 60 Hz, 1 Ph (Single Phase), Polyvinyl chloride Dosing Head, Ceramics Valve Ball, EPDM Gasket. 52.83 GPH Max Flow, 58 PSI Max Pressure, 104 °F Max Operating Temp. Control Variant A with alarm relay and analog input (DDA, DDC) w/Front-Mounted Control Panel & Spring Loaded Valve.