This gasket seals the oil filler cap on the three-point hitch system of the host tractor. It prevents fluid leakage and keeps contaminants out of the hydraulic reservoir. A degraded gasket allows oil seepage past the cap, which can lead to a drop in system pressure and eventual pump cavitation. The gasket is manufactured by AGCO to match the original cap's sealing face geometry, ensuring a consistent compression fit without over-torquing the cap.