Upgrade your diesel truck with this durable Billet DEF Fill Cap from a trusted brand. Designed for 2020-2024 6.6L L5P, 3.0L LM2/LZ0 and 2.8L LWN Duramax Diesel engines, this cap ensures a secure fit and easy access when refilling your Diesel Exhaust Fluid (DEF) tank. Crafted from 6061-T6 Aluminum and blue anodizing, it provides long-lasting performance and protection. With its sleek blue finish, this fill cap adds a touch of style and the magnet will help keep it secure during fill ups. Keep your dirt and debris out of the DEF tank using this convenient and reliable fill cap.