Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 304-8009-01 ITEM 31 found under Valve Check by Dynacon Inc. The National Stock Number assigned to this part is 4820013859077, 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 304-8009-01 ITEM 31.