The Porter Cable 887259 Piston-Ring is used for particular sander models. This ring is an essential seal located in the sander’s motor cylinder. During the operation of the motor, it moves up and down, and this ring plays a role of compressing and transferring pressure of air to enable the sanding process. Replacing a damaged piston ring has the advantage of bringing back the sander to its power and performance, and to have a consistent operation and to avoid air leaks that may lead to inefficiency.
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