Filter Element, Element Material Pleated Cellulose, Compatible Manufacturer Part Number 15 hp to 50 hp UP6-Series Units, Compatible Grainger Part Number 1NPK9, 1NPL1, 1NPL2, 1NPL3, 1NPL4, 1NPL5, 1ZPT2, 1ZPT3, 1ZPT4, 3HGC3, 3HGC4, 3HGC5, 3HGC6, 3HGC7, 3HGC8, 3HGC9, 3HGD1, 3HGD2, 3HGD3, 3HGD4, 3HGD5, 3UB84, 3UB85, 3UB86, 3UB87, 3UB88, 3UB89, 4RU68, 4RU69, 53RU34, 53RU35, 53RU40, 53RU41, 6WA82, Inside Diameter 2 5/8 in, Outside Diameter 5 in, Filter Rating 3 micron