Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number STE-3B-12N8 found under Ball Valve Ported by Whitey Co. The National Stock Number assigned to this part is 4820013784778, 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 STE-3B-12N8.