Caterpillar 1H-8171 is an O-ring seal (part number 1H-8171) designed to replace worn seals in Cat equipment. It features a 20.22 mm inner diameter, providing a precise fit for sealing hydraulic or fluid interfaces in compatible Caterpillar machinery. This part is listed as fitting models including the 120C and the 508, 518, and 528 series, making it a direct replacement option for maintaining system pressure and fluid integrity in those machines.
