Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number OSB 35-02-66 (40Q found under Purifier Centrifugal Oil by Gea Westfalia Separator Inc Div. The National Stock Number assigned to this part is 4330013508929, 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 OSB 35-02-66 (40Q.