The John Deere T27921 is a genuine OEM piston ring designed for various John Deere agricultural and industrial equipment. This durable piston ring ensures optimal engine performance and sealing. It features a diameter of approximately 51 mm and a thickness of 3 mm, with a weight of 0.02 kg. Compatible with numerous John Deere tractors, combines, cotton pickers, forage harvesters, industrial machines, loaders, skidders, and windrowers, ensuring a precise fit and reliable operation for engine maintenance and rebuilds.