Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VB2VZCO-4-S316 found under Valve Ball by Hy Lok Usa Inc. The National Stock Number assigned to this part is 4820015858299, 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 VB2VZCO-4-S316.