The Kubota RA21143520 is a genuine OEM oil seal, also known as a 'Joint Spi', designed for critical sealing applications in a wide range of Kubota agricultural and utility machinery. This high-quality seal features an inner diameter of 30mm, an outer diameter of 45mm, and a thickness of 8mm, providing a precise fit to prevent leaks and protect internal components from contaminants. It ensures reliable performance and extends the lifespan of your equipment across various Kubota B, L, and MX series tractors.