Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D2740 ITEM 5 found under Valve Vent by Walz And Krenzer Inc. The National Stock Number assigned to this part is 4820013137233, 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 D2740 ITEM 5.