Fuel tank cap for John Deere tractors 520, 530, 620, 630, 720, 730, 830 (3-Cyl), 1020, 1520, 2010, 2020, 2030, 2440, 2510, 2520, 2630, 2640, 3010, 3020, 4000, 4010, 4020, 4030, 4040, 4050, 4230, 4240, 4250, 4320, 4430, 4440, 4450, 4520, 4620, 4630, 5010