Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VNB31-2 found under Valve Butterfly by Tyco Valves And Controls Lp. The National Stock Number assigned to this part is 4820015405871, 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 VNB31-2.