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

The SPELAB Upper Coolant Tube is a premium upgrade designed to replace the factory plastic and rubber upper radiator hose on your 2017–2025 L5P Duramax. Built from high-grade 6061 aluminum with heavy-duty multi-ply silicone couplers, this system eliminates the failure-prone OEM parts and delivers long-lasting durability, clean aesthetics, and improved cooling reliability under heavy load or tuned conditions.

Upper Coolant Tube For 2017-2025 L5P Duramax Coolant Pipe Kit | SPELAB

Upper Coolant Tube Key Features

6061-T6 Aluminum Construction
Mandrel-bent aluminum tubing resists heat, pressure, and aging far better than OEM rubber.
CNC-Machined Thermostat Housing & Radiator Adapter
Ensures a perfect leak-free connection and long-term durability.
Powder-Coated Finish (Multiple Colors Available)
Durable, corrosion-resistant coating adds a premium look to your engine bay.
Direct Bolt-On Installation
No cutting or fabrication required — designed as a direct replacement for your factory upper coolant tube assembly.

L5P Upper Coolant Tube Specification

Material	6061-T6 Aluminum Construction & Silicone
Weight	1.5 kg
Installation	Engine block or thermostat housing to the upper radiator section

What's in the BOX?

1 × Aluminum upper coolant tube
2 × Silicone couplers
4 × Stainless steel T-bolt clamps

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FITMENT

2017-2025 L5P 6.6L Duramax Diesel GMC Sierra 2500 HD
2017-2025 L5P 6.6L Duramax Diesel GMC Sierra 3500 HD
2017-2025 L5P 6.6L Duramax Diesel Chevrolet Silverado 2500 HD
2017-2025 L5P 6.6L Duramax Diesel Chevrolet Silverado 3500 HD

FAQ

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.

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Video About Upper Coolant Tube

Reduce engine operating temperature through modifications (by approximately 20–25°F ≈ 11–14°C)!

Performance UpgradeInstallation Guide

OE = Weakness → Aluminum Coolant Tube = Improved reliability + Prevention of major failures

Failure PreventionInstallation Guide

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Fast Shipping Policy

Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy

Easy Return Policy

Every order comes with a 14-day free return, which means you don't have to pay for a return slip. Click for Return Policy

Coolant Tube

Upper Coolant Pipe for 2010-2024 6.7L Dodge Ram 2500HD/3500HD Radiator Pipe | SPELAB

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