This TIF KT3305 PROMAX compressor rebuild kit combines Kits KT3302, KT3303, KT3306. It includes all parts needed to rebuild the compressors on RG3300 & RG3305 series Recovery Units. Kit includes all necessary parts to rebuild the piston "SLYD" Rings, piston seal and cylinder seat seals, as well as all necessary parts to rebuild damaged valves and seals and finally the bearings and shaft seal.