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 2013-2019 Dodge Ram 2500 3500 6.7L Cummins. 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 21 PSI, Available in Anodized Sinister Gray, CNC Machined from T6-6061 Billet Aluminum, Etched Sinister Diesel Logo, Replacement for failure-prone factory cap, Fits 2013-2019 Dodge Ram 2500 3500 6.7L Cummins Coolant Reservoirs;Includes:(1) Sinister Diesel Coolant Reservoir Cap.

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