complete cng setup for diesel engines, 3 years old. taken off a 2005 Duramax I just bought. works great, just too lazy to fill two fuels. I have everything that was needed for it to be on my truck, works great for power and fuel milage! with it my truck went from 12 mpg to 20 mpg! a lot more power with it as well! have the tank which is good until 2032, the regulator assembly, lines, connector, tank straps and cover.