1 - NEW SERVICE / REBUILD KIT. THIS WILL RESTORE YOUR COMPRESSOR TO OEM OPERATING SPECIFICATIONS. FITS ALL 2685 Models. Kit includes 2 - Sleeves, 2 Cup Seals, Cylinder Sleeve O-Rings, Head Gaskets, 4 Valves. DOES not include screws, Filters, or any other parts or pieces not shown in the picture. 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 wrench 5/32 #2 Phillips 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.