253 Model Type 30 Ingersoll Rand compatible Major Overhaul Kit – 253-B. Major overhaul kits (MOKs) includes Bronze connecting rods, crankpin bushings, main bearings, gasket kit, piston ring set, intake and discharge valves, oil seal, and air filter element to rebuild one Type 30, Ingersoll Rand Air Compressor. This major overhaul kit is assembled with all the parts to completely overhaul your Ingersoll Rand compressor pump. It includes the level II, level III, level IV step saver kits so you do not have to buy each separately. This kit includes 32127417, 32127425, 32127433 IR compatible parts. This is not a Ingersoll Rand parts but it is compatible and fits to IR Air Compressors. This is a Private-label parts.