The John Deere RE44199 Filler Neck is an authentic OEM component designed for a wide range of John Deere 6000 and 7000 Series Tractors, including models such as 6100, 6200, 6300, 6400, 6506, 6600, 6800, 6900, 7200, 7400, 7600, 7700, 7800, 6110, 6210, 6310, 6410, 6510, 6610, 6810, 6910, 7210, 7410, 7510, 7610, 7710, 7810, 6120, 6220, 6320, 6420, 6520, 6620, 6820, 6920, 7220, 7320, 7420, and 7520. This critical part ensures a tight seal for fluid reservoirs, preventing leaks and protecting against contamination. Manufactured to John Deere's stringent quality standards, it guarantees precise fitment and reliable performance for your agricultural machinery.