The Kubota 1255621052 is a genuine OEM piston ring set designed specifically for Kubota D902 diesel engines. This standard size set features a 72mm bore and includes three rings per piston: a top ring with 2.0mm thickness, a second ring with 1.5mm thickness, and an oil control ring with 3.0mm thickness. Essential for maintaining proper engine compression, reducing oil consumption, and ensuring efficient engine operation.