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!., Features:Cap is rated for 15 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;Includes:(1) Sinister Diesel Coolant Reservoir Cap.. Sinister Diesel 01-16 GM Duramax 6.6L Coolant Reservoir (Degas) Cap. Coolant Reservoir (Degas) Cap for 2001-2016 GM Duramax 6.6L.. 2001-2016 Chevy/GMC 2500; 3500; 6.6L. Sinister Diesel Coolant Tank Cap. Engine Coolant Reservoir Cap. Coolant Reservoir. Coolant Tank Cap

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