​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Chesterton 22K Rod & Piston Seal is a single-acting u-cup design with a special seal-lip geometry that provides zero leakage throughout the entire operating range. The sturdy static lip stabilizes the seal to prevent rolling while the negative-rake design eases installation. This seal design is offered as a rod or piston seal and provides excellent performance in hydraulic applications.​