SKU: SD-DC-6.7P-17 Sinister Diesel Coolant Reservoir (Degas) Cap for 2017-2019 Ford Powerstroke 6.7L

Fitment

Fits 2017–2019 Ford 6.7L Powerstroke (Works with Factory and Sinister Diesel Coolant Reservoirs)

Key Features

• CNC Machined 6061-T6 Billet Aluminum – Built from solid billet aluminum for significantly greater durability than the factory plastic cap.
• 21 PSI Pressure Rating – Maintains proper cooling system pressure to support consistent engine temperature control.
• Integrated Pressure Relief System – Internal relief system is engineered to continue functioning even in the event of gasket failure.
• Anodized Sinister Blue Finish – Finished in signature Sinister Blue with a precision laser-etched Sinister Diesel logo.
• Direct Replacement Fit – Designed to replace the factory degas cap and fully compatible with Sinister Diesel aluminum coolant reservoirs.
• 1-Year Warranty – Backed by Sinister Diesel quality and customer support.

Product Overview

The factory degas cap on the 6.7L Powerstroke is a plastic component exposed to constant heat cycles and pressure. Over time, plastic caps can weaken, lose sealing strength, or fail — leading to coolant loss and inconsistent system pressure.

The Sinister Diesel Coolant Reservoir (Degas) Cap is a direct replacement designed to work with both the OEM plastic coolant tank and Sinister Diesel aluminum coolant reservoirs. CNC machined from solid 6061-T6 billet aluminum and rated at 21 PSI, it helps maintain proper cooling system pressure while eliminating a common factory weak point.

With an integrated pressure relief system and durable anodized finish, this cap is built to perform long term while adding a clean, upgraded look under the hood.

What’s Included

• (1) Sinister Diesel Coolant Reservoir (Degas) Cap – 21 PSI

Why Choose Sinister Diesel

Since 2009, Sinister Diesel has engineered upgrades that fix known OEM weak points on Powerstroke engines. This billet degas cap replaces fragile factory plastic with a durable, precision-machined solution that improves reliability and elevates the appearance of your engine bay.