The John Deere RE508118 is a genuine OEM (Original Equipment Manufacturer) injection line specifically designed for cylinder 1. This critical component ensures precise fuel delivery to the engine's first cylinder, maintaining optimal engine performance and fuel efficiency. Manufactured to John Deere's rigorous standards, it guarantees compatibility and durability for a wide range of John Deere agricultural and construction machinery, including tractors, combines, and excavators. Replacing with a genuine part like RE508118 helps prevent fuel system issues and ensures the longevity of your equipment.