The John Deere Z40994 is a genuine OEM spout tail light gasket designed for various John Deere agricultural machinery. This essential gasket ensures a secure seal for the tail light assembly on combines, cotton pickers, forage harvesters, and windrowers, protecting against moisture and debris. It is compatible with models such as 9400, 9500, 9600 combines, 9960, 9965, 9970 cotton pickers, 6610, 6710, 6810, 6910 forage harvesters, 7200, 7300, 7400, 7500, 7700, 7800 self-propelled forage harvesters, and 4890, 4895, 4990, 4995 windrowers.