Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number TSB2923 ITEM 2 found under Ball Valve Ported by Cooper Valve Co. The National Stock Number assigned to this part is 4820014081633, 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 TSB2923 ITEM 2.