Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HO1 2X1 4-25B1MC3PAX-MS found under Meter Impeller Type Liquid by Hoffer Flow Controls Inc. The National Stock Number assigned to this part is 6680013640970, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HO1 2X1 4-25B1MC3PAX-MS.