Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VU1-4B found under Valve Pneumatic Tank by Spx Corporation. The National Stock Number assigned to this part is 4820001609163, 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 VU1-4B.