The FKF 2011-2016 LML Duramax Upper Coolant Tube replaces the factory upper coolant tube with 1-3/4" 304 stainless steel, TIG welded and back purged with bead rolled lips for a coolant-tight seal. It directly addresses the boot leak issues seen with similar products on the market.

Features

• 1-3/4" 304 stainless steel construction for strong, corrosion-free use
• TIG welded and back purged for zero possibility of leaks
• Bead rolled lips for a coolant tight seal
• 2x silicone boots rated up to 392°F (200°C)
• 4x smooth T-bolt clamps for even clamping force

Why the boots matter

There have been issues with similar products on the market leaking through the silicone boots. We addressed that with high quality silicone boots designed specifically for high temperature coolant, combined with bead rolled lips on the tube itself.

Fitment

2011-2016 GM 2500HD / 3500HD trucks with the 6.6L LML Duramax.

Powder coat options

If a custom powder coat colour is desired, select “Custom Colour” and state the colour in the cart notes.

Colour link — https://www.prismaticpowders.com/canada

Included

2x +5HP FKF stickers.

Frequently asked questions

What is the lead time on this LML coolant tube?

Please allow 4-14 days for build and coat time. This tube is built to order, not pulled from a shelf. Contact us before ordering if you need an exact date.

Why do other coolant tubes leak at the boots?

Most use generic silicone boots not rated for sustained coolant temperature, and a smooth tube end with nothing for the boot to grip. Ours uses boots rated to 392°F (200°C) plus bead rolled lips on the tube for a positive seal.

Are boots and clamps included?

Yes. Two silicone boots and four smooth T-bolt clamps are included.

Which trucks does it fit?

2011-2016 GM 2500HD and 3500HD trucks with the 6.6L LML Duramax.