Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number L81400-24FN found under Valve Check by Lourdes Industries Inc. The National Stock Number assigned to this part is 4820003788453, 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 L81400-24FN.