Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST40042 found under Separator Water Liquid Fuel by Parmatic Pollution Control. The National Stock Number assigned to this part is 4330014163900, and the Federal Supply Class is 4330 Centrifugals Separators And Pressure And Vacuum Filters. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ST40042.