The General Pump 98210000 replaces a lost, damaged, or stripped cap screw. It is compatible with EZ Series 44, EZ Series 44 G, T Series 50, TP Series 51, C17, TT Series 51, EBF, TT Series 51, GBF, and TX Series “63” pumps. Dimensions of this cap screw measure 3/8" with BSP threading. It is an OEM part designed to ensure a proper fit when used with the recommended pump models.