209-01-42251 is a filter assembly for Komatsu PC800 and PC850 series excavators. It is confirmed as a genuine Komatsu part number, with aftermarket suppliers listing it for the PC800-8, PC800SE-8, PC800LC-8, PC850-8, and PC850SE-8 models . Chinese parts suppliers also reference the same number in the context of PC600-8 and PC650-8 fuel filter applications
