Upper Coolant Tube for 2017-2025 L5P 6.6L Duramax Chevy/GMC 2500HD/3500HD Coolant Pipe Kit | SPELAB
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---tab Description---
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.
2017-2025 L5P Duramax Upper Coolant Tube
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 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
---tab Fitment & FAQ---
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.
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
---tab Blog & Video---
Video About Upper Coolant Tube
Reduce engine operating temperature through modifications (by approximately 20–25°F ≈ 11–14°C)!
Performance Upgrade Installation Guide
Quickly upgrade your cooling system
Performance Upgrade Installation Guide
OE = Weakness → Aluminum Coolant Tube = Improved reliability + Prevention of major failures
Failure Prevention Installation Guide
×
---tab Shipping & Returns---
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
---tab Description---
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.
2017-2025 L5P Duramax Upper Coolant Tube
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 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
---tab Fitment & FAQ---
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.
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
---tab Blog & Video---
Video About Upper Coolant Tube
Reduce engine operating temperature through modifications (by approximately 20–25°F ≈ 11–14°C)!
Performance Upgrade Installation Guide
Quickly upgrade your cooling system
Performance Upgrade Installation Guide
OE = Weakness → Aluminum Coolant Tube = Improved reliability + Prevention of major failures
Failure Prevention Installation Guide
×
---tab Shipping & Returns---
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
SPELAB Auto Parts: 1 year from delivery; supplier conditions apply. SPELAB offers a one-year limited warranty from delivery for material/workmanship defects under normal use, original purchaser only, with proof of purchase. Consumables, wear/cosmetic damage, improper installation, alteration, misuse and removal/installation labor are excluded. Approved remedies are repair, replacement or replacement parts at SPELAB’s discretion.
Return and warranty information is based on what SPELAB Auto Parts offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
SPELAB Auto Parts warranty policyView complete warrantyProduct conditions
Return and warranty information is based on what SPELAB Auto Parts offers. Product-specific eligibility and the supplier’s published conditions apply; FullSpecDiesel does not add or extend coverage.
- Return eligibility
- SPELAB allows return requests within 30 days of delivery, with authorization and undamaged goods, original packaging and accessories. Tuners are final sale. Customer pays voluntary return shipping; original shipping is not refunded. SPELAB pays return shipping for approved damaged, incorrect or manufacturing-defective items. Transit damage must be reported within two business days and incorrect items within seven days. Based on what SPELAB Auto Parts offers.
- Return window
- Not stated for this product; see supplier terms
- Restocking fee
- See supplier terms; no product-specific fee stated
- Return shipping
- Based on the supplier’s return policy; see terms
- Made to order
- No
- Backorder status
- Not backordered
- Cancellation
- Subject to supplier terms; contact FullSpecDiesel before requesting cancellation
- Warranty provider
- SPELAB Auto Parts
- Warranty duration
- 1 year from delivery; supplier conditions apply
- Compatibility
- Listed for specific vehicle configurations
- Legal use
- Street legal
- Processing estimate
- 3–10 business days supplier processing
- Shipping
- Shipping calculated at checkout
- Signature
- No signature requirement
- Supplier
- SPELAB Auto Parts
Product compatibility is based on the vehicle and product information provided. Review your selected truck, product options, measurements, modifications, and installation requirements before ordering.