Maintain the peak performance of your pneumatic and hydraulic systems with the genuine Parker PK5002A001 Piston Seal Kit. Specifically engineered for 5-inch bore cylinders, this premium maintenance kit ensures a tight, leak-free seal and extends the operational life of your equipment. The kit features high-quality Buna-N (nitrile) elastomer sealing elements, widely recognized for their excellent durability and resistance to wear, oils, and standard hydraulic fluids. This comprehensive OEM replacement package includes all essential components for a complete rebuild, such as piston seals, O-rings, backup washers, a gland-to-head O-ring, check valve, valve screw, and a cushion bushing. Proudly manufactured in the U.S.A., it guarantees the exact fit, reliability, and uncompromising quality you expect from Parker Hannifin.