Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 23590 found under Diaphragm Pump Special Shaped by Walchem Corp. The National Stock Number assigned to this part is 4310013372120, 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 23590.