Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R9W1133 found under Filter Element Fluid by Sikorsky Aircraft Corporation. The National Stock Number assigned to this part is 4330004718599, 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 R9W1133.