Product Description
Stop seepage at the L5P water pump outlet with the MAHLE C33756 coolant pipe O-ring. Engineered to OE specs for the 2017–2020 GM 6.6L Duramax (L5P), this direct-fit seal restores proper system pressure and leak-free performance during routine service or repair.
Fitment
- 2017–2020 Chevrolet Silverado 2500HD/3500HD – 6.6L Duramax L5P
- 2017–2020 GMC Sierra 2500HD/3500HD – 6.6L Duramax L5P
Cross-Reference / Related Mahle parts on CPP Diesel
- MAHLE C33755 Coolant Water Bypass Gasket (L5P)
- MAHLE 55522 Cylinder Head Gasket – Grade A (L5P)
- MAHLE 55523 Cylinder Head Gasket – Grade B (L5P)
- MAHLE 55524 Cylinder Head Gasket – Grade C (L5P)
Notes
Lubricate the O-ring with clean coolant before install. Do not use sealant unless specified by OE service procedures. Inspect the mating pipe and housing for nicks/corrosion.
FAQ
WILL THIS FIT MY L5P DURAMAX?
Yes. C33756 is listed for 2017–2020 GM 6.6L Duramax L5P applications.
WHERE DOES THIS O-RING INSTALL?
At the water pump outlet to coolant pipe interface on the L5P cooling system.
DO I NEED SEALANT?
No. Install lubricated with coolant unless the OE procedure specifies otherwise.
IS THERE AN OEM CROSS-REFERENCE?
Yes—GM/ACDelco reference: 12644927.
Specifications for Mahle C33756
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | C33756 |
| Engine Compatibility | 2017–2020 GM 6.6L Duramax L5P |
| OEM Cross-Ref | GM/ACDelco 12644927 |
| UPC | 639789314482 |
| GTIN | 639789314482 |
| Shipping | Calculated at Checkout; optional shipping insurance available at checkout |
| Prop 65 | This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Learn more |
| What's Included | (1) Coolant pipe O-ring (MAHLE C33756) |
