The John Deere R71963 is a genuine OEM fuel injection nozzle tee fitting designed for a range of John Deere agricultural and industrial equipment. This critical component ensures proper fuel distribution to the injection nozzles, maintaining optimal engine performance and efficiency. Manufactured to John Deere's rigorous standards, the R71963 provides a reliable and durable connection within the fuel system. It is compatible with numerous John Deere tractor models including the 4030, 4040, 4230, 4240, 4430, 4440, 4630, 4640, 4840, 7020, 7520, 8430, 8440, 8630, and 8640 series.