How does a piston seal function? This product works by keeping pressure on one specific side of a piston, along with ensuring that it does not leak. Because of this, the piston is able to be moved along the bore of a cylinder with the least amount of mechanical effort. Our customers can acquire hydraulic or pneumatic piston seals from us in a special design, which makes them perfect for various systems and applications. Single action and double-acting piston seals can be offered by us.