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3. Pressure Maintenance In many applications, oil seals are designed to maintain pressure within a system. By preventing the exit of oil and the entrance of contaminants, they help in sustaining the necessary pressure levels for optimal operation. This function is especially important in hydraulic systems, where pressure plays a critical role in performance.

- O-Rings These are circular seals that create a tight fit between two surfaces, preventing fluid leaks. They are usually made of durable materials such as nitrile rubber or polyurethane.