This paper gasket seals the valve block in the hydraulic system of the host tractor. It sits between the valve block and its mounting surface, preventing fluid leaks at the interface. A compromised gasket allows hydraulic oil to bypass the valve galleries, which reduces system pressure and causes sluggish or erratic implement response. This original component is manufactured to the same thickness and crush characteristics as the factory gasket, so it maintains the correct clamping force on the valve block without over-compressing the seal. On reinstallation, ensure the mating surfaces are clean and free of old gasket material.