The General Pump 90385900 is a replacement O-ring for use inside pumps and unloaders. It's dimensions measure 25.07x2.62 mm. Made with Buna-N 70 Duro. Compatible with EM Series, EP Series, ET Series, EZ Series 44, TC Series 60, TX Series 63, TX Series 63 UI, ET1506G6U/I, TX1812HA17 pumps and TIMAX unloaders. A genuine OEM part that ensures a proper fit, material compatibility, and functionality.