The John Deere DZ128851 is a genuine OEM DEF Tank Header engineered for precise integration within the Diesel Exhaust Fluid (DEF) system of various John Deere agricultural and construction machinery. This critical component ensures proper monitoring and management of DEF levels and temperature, contributing to the efficient operation of the emissions system. It is specifically designed for John Deere 8R, 8RT, 8RX, 9R, 9RT, and 9RX series tractors, providing reliable performance and maintaining emission compliance.