Wehrli 2020-2026 L5P Duramax Upper Coolant Pipe Kit
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.
The black rubber upper radiator hose is the last unfinished thing under the hood of a dressed-up 2020-2026 Chevrolet Silverado / GMC Sierra 2500HD/3500HD 6.6L Duramax L5P. The Wehrli Upper Coolant Pipe Kit (Manufacturer Part # WCF100541) replaces it with a fabricated aluminum hard pipe, powder coated in your choice of colors, with silicone boots and stainless T-bolt clamps.
Why Choose the Wehrli Upper Coolant Pipe Kit?
- Aluminum instead of rubber – a fabricated hard pipe in place of the factory hose, with silicone boots giving flex only where it is needed.
- Heavier wall than most – Wehrli runs 14 gauge where much of the aftermarket uses 16, so the T-bolt clamps can be pulled tight without kinking or denting the tube.
- Finishes the engine bay – matches Wehrli's coolant tanks, intake kits and intercooler piping in the same powder coat range.
- Fits a stock truck – no other modifications necessary.
- Stainless T-bolt clamps included – proper clamps, not worm gear.
- Honest about what it is – this is a cleanup part, not a horsepower part. Wehrli says so themselves.
Kit Includes
- Fabricated aluminum upper coolant pipe
- High quality silicone boots
- Stainless steel T-bolt clamps
Installation Highlights
Straightforward swap: drain roughly two gallons of coolant, pull the inner fender for access, remove the factory upper radiator hose at the radiator and thermostat housing, then set the pipe into the boots and square it up before tightening. Basic hand tools.
Fits These Models
2020, 2021, 2022, 2023, 2024, 2025 and 2026 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD with the 6.6L Duramax L5P, running the factory GM radiator.
Specifications
- Construction: fabricated aluminum with silicone boots and stainless steel T-bolt clamps
- Shipping weight: 5.0 lbs
- Package dimensions: 6" W x 6" H x 24" L, ships in its own box
- Finish: custom powder coat, color selected above
- Made in the USA
Key Features at a Glance
- Aluminum hard pipe - replaces the OEM rubber hose.
- Silicone boots and T-bolt clamps - included.
- Stock truck fitment - no modifications.
- Custom powder coat finish - pick your color above.
Notes
- ⚠ Designed around the OEM GM radiator. Aftermarket radiators may cause fitment issues.
- Lead time varies by color. WCFab Red, WCFab Grey, Illusion Purple, Bronze Chrome, Candy Teal, Bengal Red, Gloss White and Gloss Black are stocked and ship in 3-5 business days. All other colors are made to order on a 10-15 business day lead time.
Installation Instructions Available Here
FASS SKU: [ADD FASS SKU]
Manufacturer Part #: WCF100541
Questions? We’re Here to Help.
Have questions about upgrades for your 6.6L Duramax L5P? Contact FASS Motorsports and we’ll get you dialed:
Phone: 636-429-7020
Email: info@fassmotorsports.com
This part fits the following vehicles:
| Years | Make & Model |
|---|---|
| 2020 | Chevrolet Silverado 2500 HD |
| 2020 | Chevrolet Silverado 3500 HD |
| 2020 | GMC Sierra 2500 HD |
| 2020 | GMC Sierra 3500 HD |
| 2026 | Chevrolet Silverado 2500 |
| 2026 | Chevrolet Silverado 3500 |
| 2026 | GMC Sierra 2500 |
| 2026 | GMC Sierra 3500 |
Fitment is listed by year, make and model. Some applications also depend on cab, bed, drivetrain or engine — if you are not sure, call 636-429-7020 or send us your vehicle details and we will confirm before you order.
