The Kubota 1550121090 Piston Ring Set is a genuine OEM replacement part designed for Kubota D722, D902, D662, Z482, and Z602 engines. This set ensures optimal engine compression and performance, fitting a wide range of Kubota compact tractors, mowers, RTVs, and excavators including B, BX, F, G, GR, K, KX, RTV, U, and ZD series models. With a bore of 72 mm, this piston ring set is crucial for engine maintenance and repair.