Avoid expensive down time! It is important to regularly service your air compressor to keep it in top condition, and to be prepared for emergencies in the field. The FSK263 Field Service Kit contains common replacement parts and instructions for the 263 air compressor. It is recommended you service the 263 at least every 2 years. The kit contains components to service both cylinders and includes: Gaskets, felt spacers, valves, seals, rings, rider rings, and instructions.