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2. Back-up Rings These are used in conjunction with seals to provide additional support and prevent extrusion of the seals under high pressure. Back-up rings help extend the life of the seals by preventing wear and tear.

1. Leak Prevention One of the primary functions of a hydraulic piston oil seal is to prevent fluid leakage. A faulty or worn-out seal can lead to significant hydraulic fluid loss, which not only reduces the system's efficiency but can also result in environmental hazards, increased operational costs, and potential equipment damage.