The A0229978648 is a genuine Mercedes-Benz Unimog sealing ring, also known as a shaft seal, with precise dimensions of 30mm inner diameter, 40mm outer diameter, and 5mm thickness. This OEM component ensures optimal sealing performance for critical applications in a wide range of Unimog models including U 403, U 406, U 413, U 416, U 417, U 421, U 424, U 425, U 427, U 435, and U 437. It is also compatible with MB-Trac series 700, 800, 900, 1000, 1100, 1300, 1500, 1600, 440, 441, 442, and 443, providing reliable fitment and durability.