Exergy 01-04 Chevrolet Duramax 6.6L LB7 Return Line Gasket Kit

E05 10104 Are you replacing the fuel injectors or have them out for a refresh and don't want to reuse the original return line gaskets? You are making the right choice. The last thing you want is for one of your original return gaskets to start leaking diesel fuel in your oil. Replacing the return line gaskets is cheap insurance so you won't have an issue when you get the truck back together.