Product Description
MAHLE C33755 is an OE-style coolant water bypass gasket engineered for the 2017–2020 GM 6.6L Duramax L5P. It restores a dependable seal at the bypass passage to help prevent coolant leaks and maintain proper operating temperature.
- Direct-fit, OE-style replacement for L5P cooling system bypass joint
- Built to MAHLE sealing standards for long service life
- Ideal for leak repair or when servicing adjacent cooling components
Fitment
- 2017, 2018, 2019, 2020 Chevrolet Silverado 2500HD / 3500HD, 6.6L Duramax L5P
- 2017, 2018, 2019, 2020 GMC Sierra 2500HD / 3500HD, 6.6L Duramax L5P
Cross Reference / IDs
- MAHLE: C33755 (Engine Coolant Water Bypass Gasket)
- GTIN/UPC: 00639789314475
What’s Included
- (1) Coolant water bypass gasket, MAHLE C33755
FAQ
Will this fit my 2017–2020 L5P Duramax?
Yes—this gasket is listed for 2017–2020 Chevrolet/GMC 2500HD/3500HD with the 6.6L L5P engine.
Is this an OEM-style part?
Yes—MAHLE designs this gasket as an OE-style replacement that meets factory specifications for fit and function.
Do I need any sealant?
Typically no—install clean and dry unless your service manual specifies a sealant at this joint.
What companion parts should I consider?
Inspect related L5P coolant pipe O-rings and thermostat housing seals during service; replace as needed.
Helpful Notes
- Clean both mating surfaces and verify no burrs or corrosion before installation.
- Refill and bleed the cooling system per OEM procedure after reassembly.
