John DeereDEF Filler NeckPart No: DZ122990

The John Deere DEF Filler Neck (part number DZ122990) is designed to provide a secure, durable connection point for refilling Diesel Exhaust Fluid (DEF) tanks. Engineered for precise fitment, this component helps ensure smooth, spill-free DEF transfer and minimizes the risk of contamination during the refueling process. Its rugged, chemical-resistant construction stands up to repeated use and exposure to DEF fluid, vibration, and extreme temperatures—making it ideal for agricultural, construction, and industrial applications. The DZ122990 supports efficient emissions system function by maintaining the integrity of the DEF supply chain, helping your equipment stay compliant with emissions regulations. Whether you’re replacing a damaged filler neck or upgrading for a better fit and seal, this part ensures dependable performance and cleaner operation. Rely on Doggett John Deere for trusted DEF system components that help keep your machines running efficiently and environmentally responsible in the field or on the job site.