Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SAUER4000 found under Vacuum Pump Unit Reciprocating by American Thermaflo Corp. The National Stock Number assigned to this part is 4310014424600, 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 SAUER4000.