Billet Coolant Reservoir (Degas) Cap

Features:

• Replaces weak factory plastic coolant cap
• CNC machined from T6-6061 billet aluminum
• Fits 1994–2016 Ford Powerstroke 7.3L to 6.7L
• Compatible with OEM and Sinister reservoirs
• Internal pressure relief system for safety
• Functions like factory cap with upgraded design
• Etched Sinister Diesel logo adds custom look
• Available in gray or Sinister Blue finish
• Durable construction resists cracking and leaks
• Provides a secure and reliable reservoir seal
• Backed by a 1-year manufacturer warranty
• Enhances under-hood appearance and reliability

Say Goodbye To Cheap Plastic And Upgrade With Confidence

If you're tired of dealing with cheap plastic degas caps that crack, warp, or just don't seal properly, the Sinister Diesel Billet Coolant Reservoir Cap is the upgrade your Powerstroke needs. Designed for Ford trucks from 1994 to 2016, this cap brings a level of durability and style that factory caps simply can’t match. It’s CNC machined from solid T6-6061 billet aluminum, so you’re getting strength that can handle high engine bay temps and long-haul pressure. This isn’t just a cosmetic piece, it’s built to work hard while looking sharp. Available in Sinister Blue or gray, the finish pops under the hood while the etched Sinister logo gives it that custom touch. Best of all, it installs in minutes with zero fuss, locking into your factory or Sinister coolant reservoir with a perfect fit. Whether you're doing preventative maintenance or just want a cleaner, tougher look, this cap is the small detail that makes a big impact.

Built For Strength Where Factory Caps Fail

The Sinister SDDCFORD94 Billet Coolant Reservoir Cap is engineered to replace the failure-prone plastic caps found on Ford Powerstroke coolant reservoirs from 1994 to 2016. Made from CNC-machined T6-6061 billet aluminum, this cap offers superior strength and longevity under the thermal and pressure stress of daily driving, towing, or off-road conditions. It features an internal pressure relief system that helps regulate system pressure and provides a backup safety function in case of gasket failure. Unlike stock units that degrade over time, this billet cap resists warping and cracking, ensuring a consistent seal and reliable performance. It is designed to work with both OEM and Sinister Diesel coolant tanks, making it a seamless fit regardless of your current setup. The etched Sinister logo and anodized finish not only enhance durability but also give your engine bay a premium look. Backed by a 1-year warranty, this cap delivers the balance of form and function that serious Powerstroke owners expect.

Fits: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Ford F250/F350 7.3L/6.0L/6.4L/6.7L Powerstroke

Notes:

• Fits 1994–2016 Ford Powerstroke 7.3L, 6.0L, 6.4L, and 6.7L engine
• Compatible with both OEM and Sinister Diesel coolant reservoirs
• Replaces factory plastic caps known to crack and leak
• Machined from T6-6061 billet aluminum for strength
• Includes internal pressure relief system for added safety
• Available in Sinister Blue or gray anodized finish
• Etched Sinister Diesel logo provides a custom appearance
• Enhances both function and under-hood aesthetics
• Provides a secure, leak-resistant seal under high pressure
• Backed by a 1-year manufacturer warranty