HSP Diesel 2017-2019 L5P Duramax Upper Coolant Tube - 637-1-HSP

HSP Diesel L5P 2017-2019 Upper Coolant Tube

Part Number: 637-1-HSP

The 637-1-HSP is best known as the HSP Upper Coolant Tube for the 2017-2019 L5P Duramax-equipped Chevrolet and GMC trucks. This is an often-overlooked component that can truly elevate the look of your engine bay.

Why Would You Need the HSP Upper Coolant Tube?

The factory upper coolant tube is functional but lacks durability and aesthetic appeal. It can crack over time due to its construction, and it simply doesnt match the performance and visual standards of the L5P platform.

What Makes the HSP Upper Coolant Tube Different?

The HSP Upper Coolant Tube is precision-built from aluminum to prevent failures and add durability. The aluminum construction allows for powder coating in a range of colors and is topped with the HSP Diesel logo for a custom look. Slight precision bends ensure a perfect drop-in fit with factory components—no modifications required. Installation is quick and easy with basic tools and knowledge.

Whats Included:

• 1x Radiator Hose Tube w/ Logo (HSP-IN-248)
• 4x 2" T-Bolt Clamp (RFB-370-RFAB)
• 2x 2"x4" Straight Boot (RFB-691-RFAB)

Special Note:

This part fits only 2017-2019 L5P models. Although the VIN code (Y) is shared with later models, changes in the engine bay layout make it incompatible with 2020+ trucks. Please verify the model year before ordering.

Vehicle Fitment:

• L5P: 2017-2019 (8th digit of VIN = Y)

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

Overview:

• Maintains factory routing
• 2" outer diameter matches factory hose size
• No modifications necessary
• Enhances engine bay appearance
• Durable aluminum construction

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.