Sinister Diesel Anodized Gray Coolant Reservoir Cap 01-16 GM 6.6L Duramax FOX-985-24-103 Constructed from heavy-duty aluminized steel

Constructed from heavy-duty aluminized steel with smooth mandrel bends

Cognito Torsion Bar Keys levels the front with the rear of the truck

don’t settle for generic replacement parts

With a 4" inlet x 6" outlet and 9" inch length

SCT offers the latest technology in this tuner with built-in Wifi capabilities

Sinister Diesel Anodized Gray Coolant Reservoir Cap 01-16 GM 6.6L Duramax FOX-985-24-103 Constructed from heavy-duty aluminized steelDress up your engine in your 6. 6L Duramax with the Sinister Diesel Coolant Reservoir cap. Featuring an anodized gray finish and built from billet aluminum, you can count only great looks and a product that won't crack like the factory cap for years to come. This cap is 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.