Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S-25 ALL BRONZE 3-4IN FLANGE found under Pump Unit Centrifugal by Armstrong Pumps Inc. The National Stock Number assigned to this part is 4320000197028, 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 S-25 ALL BRONZE 3-4IN FLANGE.