The General Pump 98217600 replaces a lost, damaged, or stripped cap screw. It is compatible with CW2004, EZ Series 44, EZ Series 44 E, EZ Series 44 G, EZ Series 44 S, TC Series “60”, TX Series “63”, and TX1812HA17 pumps. Dimensions of this cap screw measure 1/2" with BSP threading. It is an OEM part designed to ensure a proper fit when used with the recommended pump models.