Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 290963D found under Vacuum Pump Rotary by Hercules Engine Co Inc. The National Stock Number assigned to this part is 4310000013493, and the Federal Supply Class is 4310 Compressors And Vacuum Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 290963D.