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5. Wiper Seals These seals serve a dual purpose of preventing dirt and debris from entering the cylinder while also preventing fluid leakage.

The metal case reinforces the structure of the seal, allowing it to withstand external forces and maintain its shape under operational stress. Additionally, many seals feature a spring located behind the sealing lip, which exerts constant pressure on the lip against the shaft. This pressure helps maintain the integrity of the seal, especially in dynamic applications where the shaft is rotating.