The John Deere AR40145 Piston Ring Kit is a genuine OEM component designed for heavy-duty applications in various John Deere engines and machinery. This kit includes the necessary rings to restore optimal compression and oil control for a single piston. It is engineered to meet the precise specifications of John Deere equipment, ensuring durability and reliable performance. This kit is suitable for a range of John Deere tractors including the 4040, 4240, 4440, 4640, 4840, 8430, 8440, 8630, and 8640 models, among others.