Jun-Air 5470476 service kit used on oil-less 2xOF302 series. Service kit returns your unit to original factory performance specifications. Recommended service interval is every 8,000 hours. Service kit includes: Rod Assemblies, Cylinders, Cylinder Heads, Intake Filters, Valve Plates and Valves, Gaskets, Unloader Valve, Non-Return Valve O-Rings & Springs.