6.6 L Duramax Diesel Block Heater Cord 2001-2018+ Chevy GMC Silverado 2500 3500 Compatible with: All 2001-2018+ Duramax 6.6L Diesel Engines Chevy GMC 2500 3500 High Quality Rubber for long life and flexability in the cold. Heat sheilding and Cap included! 1500w rated