1、Fitment: DEF conversion harness is specifically designed for VNL, replacement for Mack 2010+, ensuring compatibility and easy installation for a seamless upgrade. 2、Replacement OE: Replacing manufacturer part number for reference is 24399920. Please make sure the OE number matches the part you are replacing. 3、High Toughness Materials: Made of heat resistant ABS materials, ensuring long term use without deformation or rust, providing reliable conversion function for vehicles. 4、Optimized Performance: Enhances transmission efficiency and system reliability, providing lasting support for vehicle performance and DEF system operation. 5、Long Lasting Durability: Engineered for longevity and robustness, offering a dependable solution for maintaining optimal functionality and performance for your vehicle.