The Case-IH BN311305 O-Ring is a genuine OEM replacement part designed to provide a secure and leak-free seal in various Case-IH agricultural and construction equipment. This O-ring measures approximately 21.82 mm (0.859 in) inner diameter, 26.90 mm (1.059 in) outer diameter, and 2.54 mm (0.100 in) thickness. It is crucial for maintaining system integrity and preventing fluid loss in compatible machinery, including MXM, MXU, Puma, Maxxum, CX, JX, and Farmall series tractors.