This hydraulic rubber seal sits between two mating faces in the hydraulic system, preventing fluid leakage at the joint. It is installed at a connection point where a static seal is required to maintain system pressure and exclude contaminants. A degraded seal allows oil to weep past the interface, which reduces available flow to downstream actuators and can draw air into the circuit. This seal is manufactured to the original profile dimensions so it seats fully in the groove without being pinched or rolled during assembly. On installation, ensure the sealing surfaces are clean and free of burrs, and lubricate the seal lightly with hydraulic fluid before fitting.