Upper Coolant Tube for 2017-2025 L5P 6.6L Duramax Chevy/GMC 2500HD/3500HD Coolant Pipe Kit | SPELAB

This 6061-T6 aluminum upper coolant tube gives 2017-2025 L5P Duramax HD trucks a direct-fit replacement for factory plastic and rubber upper radiator hose components.

Why should I upgrade my L5P Duramax to an aluminum upper coolant tube?

The factory upper radiator hose uses plastic and rubber components that are prone to failure under heat and pressure. SPELAB's 6061-T6 aluminum tube provides a long-lasting, leak-free solution that resists aging and improves overall cooling reliability.

Is this coolant pipe kit compatible with both Sierra and Silverado HD trucks?

Yes, this kit is specifically designed for 2017-2025 GMC Sierra 2500/3500 HD and Chevrolet Silverado 2500/3500 HD trucks equipped with the 6.6L L5P Duramax Diesel engine.

Does the installation of the SPELAB upper coolant tube require any modifications?

No, this is a direct bolt-on replacement for your factory upper coolant tube assembly. It requires no cutting or custom fabrication during installation.

What material are the couplers and clamps made of in this kit?

The kit features heavy-duty multi-ply silicone couplers and four stainless steel T-bolt clamps to ensure a secure, leak-free connection between the aluminum tube and the engine/radiator adapter.

Can this upgrade help reduce engine operating temperatures?

Yes. By replacing aging OEM rubber parts with mandrel-bent 6061 aluminum tubing, this modification helps improve cooling reliability and can reduce engine operating temperatures by approximately 20–25°F under heavy load.

Best For

• 2017-2025 Chevrolet Silverado and GMC Sierra 2500HD or 3500HD trucks with the 6.6L L5P Duramax
• Owners replacing factory plastic and rubber upper radiator hose components
• Heavy-duty or tuned trucks needing durable aluminum cooling-system plumbing
• Direct bolt-on installations using included silicone couplers and stainless T-bolt clamps