Sinister SDDFC67P110121 Powerstroke Exhaust Fluid (DEF) Cap | 2011-2022 Ford F250/F350 6.7L Powerstroke

Features:

• Fits 2011–2022 Ford F250 and F350 6.7L
• Direct replacement for factory DEF cap
• Machined from T6-6061 billet aluminum
• Signature Sinister Blue anodized finish
• Laser etched with Sinister Diesel logo
• Improves underhood look with custom styling
• Includes O-ring for a secure, tight seal
• Strong and corrosion resistant construction
• Simple drop-in installation in minutes
• Built for long-term durability and fitment

Add A Bold Touch To Your Powerstroke With One Simple Upgrade

If you're looking to clean up your engine bay while adding a little attitude, the Sinister Diesel DEF Cap is a small detail that makes a big statement. Designed for 2011–2022 Ford F250 and F350 6.7L Powerstroke trucks, this anodized cap replaces the boring stock plastic version with a bold Sinister Blue finish and laser-etched logo that instantly elevates your underhood look. It’s CNC machined from billet aluminum, giving it a solid, premium feel the moment you handle it. Installation takes just seconds, and the included O-ring ensures a snug, leak-free fit every time you top off your diesel exhaust fluid. Whether you’re building out a full custom engine bay or just want to ditch cheap plastic parts, this cap adds a visual upgrade without breaking the bank. Plus, it pairs perfectly with other Sinister hardware to keep your truck looking clean and cohesive. When it comes to custom details, this is an easy win you’ll notice every time you pop the hood.

Billet Construction And Factory Fit Designed For Long Lasting Function

The Sinister SDDFC67P110121 DEF Cap is engineered for long-term durability and precision fitment on 2011–2022 Ford 6.7L Powerstroke models. Machined from T6-6061 billet aluminum, this cap offers a much stronger and more wear-resistant alternative to the factory plastic version. The clear advantage lies in its rugged structure and high-quality finish, which stands up to heat, fluids, and long-term use without fading or warping. The cap comes anodized in Sinister Diesel’s signature blue, a finish that resists corrosion and helps maintain a clean, uniform appearance over time. A laser-etched Sinister logo adds a touch of detail and brand identity. It’s a direct-fit part and uses the included O-ring to ensure a secure seal without leaks or rattle. With no special tools or modifications needed, installation is quick and straightforward. Whether for appearance or durability, this cap provides a dependable solution for protecting your DEF system while adding custom character under the hood.

Fits: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 Ford F250/F350 6.7L Powerstroke

Notes:

• Designed as a complete replacement, not a cap cover.
• Compatible with 2011–2022 Ford F250/F350 6.7L Powerstroke.
• Made from CNC machined T6-6061 billet aluminum.
• Finished in signature Sinister Blue anodizing for corrosion resistance.
• Laser-etched Sinister Diesel logo adds custom detail.
• Includes O-ring to ensure proper sealing and fitment.
• Reuses factory diaphragm for functionality and pressure balance.
• Installs easily in seconds with no tools required.