Replace those worn-out gaskets with new ones. The driver kit is an assortment of common parts that need to be replaced over time due to wear and tear. Driver kit fits P635. This kit contains cap gasket, piston driver, piston o-ring, cylinder o-ring, bumper.

• Replacement parts that fit Grex P635
• The P635KB2 kit contains: Cylinder Cap O-Ring 96649, Piston Driver Assembly 63502, Piston O-Ring 96634, Mini O-Ring 96650 and Small Exhaust O-Ring 63505