THIS LISTING IS FOR 1 - NEW SERVICE / REBUILD KIT. THIS WILL RESTORE YOUR COMPRESSOR TO Original OPERATING SPECIFICATIONS. Fits all Standard models 2668CE22 2668CE44 2668CHI22 2668CHI44 2688CE22 2688CE44 2688CHI22 2688CHI44 2668CE32 2668CE40 2668CHI32 2668CHI40 2668CS44 2688CE32 2688CE40 2688CHI32 2688CHI40 2688CS44 These have part dimensions of approximately: Cylinder Sleeve is H 57.25 x 28 ID and a Cup seal of 39.30 in mm. If you have different dimensions this will NOT fit your model. The KITS include Cylinder Sleeves, Cup Seals, O-rings, Head Gaskets, and Valves ONLY. Does NOT include any other parts, pieces, filters, etc. Does not include the Compressor. This returns your unit to original factory performance Pressure specifications. Recommend for service every 2 years. Tools The following tools are used in the maintenance and overhaul procedures. Adjustable open-end wrench Allen 5/32 #2 screwdriver Small flat-blade screw-driver Overhaul Procedure When the compressor run time reaches 6000 hours (or a multiple of 6000 hours) it is time to replace certain items in the compressor. These include the piston cups, piston seals and head gaskets (if needed) of the compressor.