This is a genuine Shibaura 050609821 oil seal, also referred to as a 'joint spy', designed to provide a critical sealing function in various Shibaura and Iseki agricultural and compact utility machinery. With precise dimensions of 25mm inner diameter, 40mm outer diameter, and 7mm height, this OEM seal ensures effective retention of lubricants and prevents the ingress of dirt and contaminants, maintaining optimal performance and longevity of components. It is a direct replacement part for numerous Iseki TX, TL, TS, and TU series tractors.