Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9104R055 ITEM 20 found under Stem Fluid Valve by Aerocontrolex Group Inc. The National Stock Number assigned to this part is 4820013680102, 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 9104R055 ITEM 20.