Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9955-000-002 ITEM 8 found under Seat Valve by Acorn Engineering Company. The National Stock Number assigned to this part is 4820015017828, 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 9955-000-002 ITEM 8.