Description
Upgrade your factory plastic DEF cap with the DmaxStore Billet DEF Cap, a high-quality, American-made replacement engineered for all Duramax-powered GM trucks from 2016–2025.
Crafted from 6061-T6 aluminum and finished with a vibrant blue anodized coating, this cap not only improves durability but adds a clean, custom look to your fuel door. The built-in magnet allows you to stick the cap to the inside of the fuel door during DEF fill-ups, while a Viton O-ring ensures a tight, chemical-resistant seal.
This is the last DEF cap you’ll need—no more cracking, swelling, or lost caps.
Features:
– CNC-machined from 6061-T6 billet aluminum
– Blue anodized finish for corrosion protection
– Built-in magnet for easy fuel door storage
– Chemical-resistant Viton O-ring
– Direct replacement for GM part #: 23138955
– Proudly made in the USA
What’s Included:
– (1) Billet Aluminum DEF Cap
– (1) Viton O-ring
– (1) Built-in storage magnet
Vehicle Fitment:
2020–2025 Silverado HD / Sierra HD 6.6L L5P Duramax
2020–2025 Silverado 1500 / Sierra 1500 3.0L LM2 & LZ0 Duramax
2016–2022 Colorado / Canyon 2.8L LWN Duramax
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