Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 176A98 found under Disk Valve by Ross Operating Valve Co. The National Stock Number assigned to this part is 4820000341829, 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 176A98.