Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 03012723B-5.11IN found under Impeller Pump Centrifugal by Grundfos Cbs Inc. The National Stock Number assigned to this part is 4320013203805, and the Federal Supply Class is 4320 Power And Hand Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 03012723B-5.11IN.