91835128 Grundfos DMX Mechanical Diaphragm Chemical Metering Liquid End Only – No Motor, Type Key: DMX 67-10 B-PVC/V/G-X-F1A7A7. 3/4″ x 3/4″ NPT Male Connections, PVC Dosing Head, Glass Valve Ball, FKM Gasket. 17.70 GPH Max Flow, 145 psi Max Pressure, 104 °F Max Operating Temp. Manual Control w/No Control Panel & Standard Valve.