The 637-2-HSP is best known as the HSP Upper Coolant Tube for the 2020-2021 L5P Duramax-equipped Chevrolet and GMC trucks. The Upper Coolant Tube

Why would you need the HSP Upper Coolant Tube for the 2020-2021 L5P Trucks?
The factory upper coolant tube is a piece that just looks out of place. While the factory part works alright, it can fail due to the construction and the overall look just does not do the L5P engine the justice that it deserves.

What does the HSP Upper Coolant Tube do differently?

To start the HSP Upper Coolant Tube is made of aluminum. This was done to prevent cracking that can cause cooling system failures. We also made it out of aluminum because we wanted you to be able to clean up the engine bay in that L5P Duramax.

With powder coat options and the HSP Diesel logo that sits right up top, you can see the difference between the HSP Upper Coolant Tube and the factory piece immediately. We used slight bends to create the perfect drop-in piece.

This creates a piece that will fit with all factory parts and gives the best flow through the Upper Coolant Tube possible. This part requires no modifications to install and can be done quickly with basic knowledge.

What comes with the HSP Upper Coolant Tube?

• (1) Aluminum 2 inch L5P (20-21) Radiator Hose Tube
• (2) 2 inchx3 inch Straight Boot
• (4) 2 inch T-Bolt Clamp

Special note

This only Fits the 2020-2021 L5P engines even though the Vin code is the same. This is due to small changes that were made in the engine bay. Please be sure you are ordering for the correct year truck.

What Does the HSP Upper Coolant Tube fit?

L5P: 20-21 VIN Code Y
How do people know the VIN code?

Engine code is dictated by the 8th character of the VIN number. The 10th character is the year of the truck.

Overview

Maintains factory routing
2 inch OD tubing to match factory hose size
No modifications are necessary
Dress up the engine bay
Metal Replacement
Our Warranty

HSP No BS Limited Lifetime Warranty
At HSP we believe in our products and we stand firmly behind every single one that leaves our facility. For years we have taken care of almost everything & anything that our customers had issues with, but we didn't have a set in stone warranty.

We have always gone above and beyond for our customers which set us apart from the rest.

We will continue that same standard, but now we are taking things to the next level.