Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 325B380-1 found under Valve Check Oxygen System by Martin Baker America Inc. The National Stock Number assigned to this part is 4820013644839, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 325B380-1.