Name: Sinister Diesel Coolant Reservoir (Degas) Cap (SDDCDMAX01) for 2001-2016 Duramax 6.6L
Brand: Sinister Diesel
SKU: SDDCDMAX01
Availability: InStock

Sinister Diesel Coolant Reservoir (Degas) Cap (SDDCDMAX01) for 2001-2016 Duramax 6.6L

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The Sinister Diesel Coolant Reservoir Cap is a factory-style replacement with a custom design. Made from CNC-machined T6-6061 aluminum, it fits OEM and Sinister Diesel reservoirs for 2001-2016 GM Duramax models. It includes an internal pressure relief system for reliability, even if the gasket fails. Available in gray or Sinister Blue, it combines durability with a stylish look.

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Description

This new Coolant Reservoir (Degas) Cap functions like a factory cap, but features custom Sinister Diesel looks. The cap fits OEM or Sinister Diesel Coolant Reservoir for the 2001-2016 GM Duramax. It is made from CNC machined, solid billet T6-6061 aluminum with an interior pressure relief system, so it will continue to function even in case of a gasket failure. Available in gray or Sinister Blue, this cap looks as good as it works!

Additional information

Weight	1 lbs
Dimensions	5 × 5 × 5 in
Manufacturer	Sinister MFG

Fitment

2016 Chevy/GMC 2500 6.6L

2016 Chevy/GMC 3500 6.6L

2015 Chevy/GMC 2500 6.6L

2015 Chevy/GMC 3500 6.6L

2014 Chevy/GMC 2500 6.6L

2014 Chevy/GMC 3500 6.6L

2013 Chevy/GMC 2500 6.6L

2013 Chevy/GMC 3500 6.6L

2012 Chevy/GMC 2500 6.6L

2012 Chevy/GMC 3500 6.6L

2011 Chevy/GMC 2500 6.6L

2011 Chevy/GMC 3500 6.6L

2010 Chevy/GMC 2500 6.6L

2010 Chevy/GMC 3500 6.6L

2009 Chevy/GMC 2500 6.6L

2009 Chevy/GMC 3500 6.6L

2008 Chevy/GMC 2500 6.6L

2008 Chevy/GMC 3500 6.6L

2007 Chevy/GMC 2500 6.6L

2007 Chevy/GMC 3500 6.6L

2006 Chevy/GMC 2500 6.6L

2006 Chevy/GMC 3500 6.6L

2005 Chevy/GMC 2500 6.6L

2005 Chevy/GMC 3500 6.6L

2004 Chevy/GMC 2500 6.6L

2004 Chevy/GMC 3500 6.6L

2003 Chevy/GMC 2500 6.6L

2003 Chevy/GMC 3500 6.6L

2002 Chevy/GMC 2500 6.6L

2002 Chevy/GMC 3500 6.6L

2001 Chevy/GMC 2500 6.6L

2001 Chevy/GMC 3500 6.6L

Features

Cap is rated for 20 PSI
Available in Anodized Sinister Blue or Gray
CNC Machined from T6-6061 Billet Aluminum
Etched Sinister Diesel Logo
Replacement for failure-prone factory cap
Fits 2001-2016 GM Duramax Coolant Reservoirs
1 Year Warranty

Includes

(1) Sinister Diesel Coolant Reservoir Cap

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About brand

Sinister Diesel builds performance and reliability parts for diesel trucks. The company focuses on cooling, durability, and proper fitment. Sinister Diesel performance parts support daily driving, towing, and work use. Sinister designs cooling systems, charge pipes, and fuel system components. These parts help manage heat and reduce stress on the engine. Better cooling supports consistent performance under load. Truck owners trust the brand for dependable upgrades. These parts perform well in real-world driving conditions.

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