HSP Diesel Upper Coolant Tube for 2020-2024 Chevrolet and GMC L5P Duramax

HSP Diesel L5P 2020-2024 Upper Coolant Tube

Part Number: 637-2-HSP

The 637-2-HSP is best known as the HSP Upper Coolant Tube for the 2020-2024 L5P Duramax-equipped Chevrolet and GMC trucks.

Why Would You Need the HSP Upper Coolant Tube?

The factory upper coolant tube looks out of place in the L5P engine bay. While it functions, the stock design is visually unappealing and susceptible to failure due to weaker construction. HSP created a high-strength, better-looking alternative that complements the power and design of the L5P platform.

What Makes the HSP Upper Coolant Tube Different?

The HSP Upper Coolant Tube is crafted from aluminum to eliminate the cracking issues common with factory plastic parts. Its powder coatready and branded with the HSP Diesel logo for a clean, custom look. With precision bends for a factory-fit installation, this tube drops in without any modification, offering excellent coolant flow and a noticeable upgrade in aesthetics and durability.

Whats Included:

• 1x Radiator Hose Tube w/ Logo (HSP-IN-249)
• 1x 2" T-Bolt Clamp (RFB-370-RFAB)
• 1x 2" 95degree Boot (RFB-689-RFAB)
• 1x 2"x4" Straight Boot (RFB-691-RFAB)

Special Note:

This kit fits only the 2020-2024 L5P engines, despite sharing the same VIN code. Small changes in the engine bay design make it incompatible with earlier models. Please confirm your vehicles year before ordering.

Vehicle Fitment:

• L5P: 2020-2024 (8th digit of VIN = Y)

How to Verify: The 8th character of the VIN indicates the engine code. The 10th character specifies the model year.

Overview:

• Maintains factory routing
• 2" outer diameter to match OEM hose sizing
• Direct bolt-in, no modifications required
• Powder coatready aluminum construction
• Cleans up and enhances engine bay appearance

Our Warranty

HSP No BS Limited Lifetime Warranty
We believe in our products and back every one with our No BS Warranty. For complete terms, coverage details, and how to submit a claim, click here.