NEW Top Quality Heavy Gauge Block Heater Cord. Compatible with: All 2001-2017 Duramax 6.6L Diesel Engines in any vehicle. 5 feet long power cord for 120V AC. This cord can easily and safely power heaters up to 1500w. Made with a high quality flexible rubber sheathing (not a cheap plastic covering that cracks in the cold) This little cord can be a hard to find part ..... and worth every penny in a cold climate. Plug ends are molded into cord, not just glued on to it like products of lesser quality. Keeps moisture out. Works with OEM factory heater. Replace an old heater cord with this tough economical cord. No complicated (and expensive) built-in thermostat to let you down later.