Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FNW600BL found under Valveball by Fnw Valve Co. The National Stock Number assigned to this part is 4820016945893, 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 FNW600BL.