You will find hydraulic cylinder wiper seals at the mouth of the cylinder barrel in front of the rod seal. This is the seal that is usually visible when you inspect a cylinder externally. As the name suggests, the role of the wiper seal is to clear contaminants from the rod as the cylinder extends and retracts. It moves ahead of the rod seal and prevents external contaminants from getting under the seal and causing leakage, or entering the system and causing premature wear. The wiper seal also serves to retain the internal fluid lubrication film on the rod as it retracts..
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How to calculate O-Ring cord length needed: ( ( OD + ID ) / 2 ) x Pi = length Pi=3.14159 Inside Diameter (ID) = Outside Diameter (OD) - twice the cross section (C/S) ID = OD - (2 x C/S)