Sinister Diesel Coolant Reservoir Degas Cap 01-16 GM 6.6L Duramax KCT-300519 is that of a blown

is that of a blown or weak pressure relief valve

High RPM's

Add-a-leafs can be the ticket when only 1-2" of lift is desired

The simplest way to circumvent this issue is with a quality

Sinister Diesel Coolant Reservoir Degas Cap 01-16 GM 6.6L Duramax KCT-300519 is that of a blownYes, it looks cool and yes its built from from better materials than the factory cap in you 6. 6L Duramax. Featuring an anodized blue 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.