Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number L100S1 found under Vacuum Valve by Veeco Instruments Inc. The National Stock Number assigned to this part is 4820008478734, 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 L100S1.