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

Was: $77.99
Sale: $59.99
Save: 23%
Save: $18.00



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, this cap looks as good as it works! 


  • Cap is rated for 15 PSI
  • Available in Anodized Sinister 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


  • (1) Sinister Diesel Coolant Reservoir Cap


Shipping Information

  • Item Requires Shipping
  • 2.0 lbs.
  • W4.0000” x H4.0000” x L4.0000”

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