Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 72021052003 found under Disk Valve Discharg by Newport Scientific Inc. The National Stock Number assigned to this part is 4310001395427, 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 72021052003.