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KKT Commercial Vehicle Systems is the exclusive Distributor of Metelli & KKT brand valve seat inserts. All KKT inserts are premium (hard) seats with a typical hardness range of 35-40 Rockwell "C" Scale. All valve seat inserts are individually cast to ensure proper material transfer and formation. Different alloys are utilized depending on the specific requirements of an engine or fuel delivery.Coverage Include American, European and Japanese Heavy trucks and Vehicles.KKT inserts for Heavy Duty Diesel Engines (Caterpillar, Cummins, Detroit Diesel, Mack, etc. ) are supplied in materials that meet or exceed OEM specifications for the particular application. Standard size inserts are exact O. E. Duplicates dimensionally and oversize inserts have been designed to meet particular requirements of the aftermarket.