Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VF00900 found under Valve Butterfly by Darley W S Co. The National Stock Number assigned to this part is 4820016279771, 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 VF00900.