Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1NS125B found under Valve Shutoff by Alta Robbins Inc. The National Stock Number assigned to this part is 4820011827443, 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 1NS125B.