This O-ring seals a connection point within the hydraulic system of a baler. It prevents fluid leakage at the joint between two mating components, maintaining system pressure and preventing contamination ingress. A degraded or nicked O-ring allows external leakage and can introduce air into the circuit, leading to erratic cylinder operation and reduced system efficiency. This component matches the original seal profile for the housing groove, ensuring proper compression without over-tightening.