Upgrade your Cummins engine with the genuine 5307947 DEF Diesel Exhaust Fluid Filler Cap. Designed specifically for compatibility with Cummins models, this OEM filler cap is crafted from durable plastic with a textured matte finish that complements your vehicle?s aesthetic. The cap features a locking mechanism and comes with two keys for secure access, ensuring your DEF stays where it belongs?inside the tank. Installation is a breeze thanks to the screw-on attachment type; no drilling or modifications are needed. The cap is 100% leak tested, so you can trust that your exhaust system remains intact. With the included gasket, you?re all set for a reliable and tight seal. Proudly made in the United States, this item is a practical choice for maintaining your Cummins engine's DEF system. Exact item set is shown. New open box with original packaging. Set weight 9 oz. Made in USA. No returns if installed. Please review our business policies in our store for information regarding returns, shipping and warranties.