Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FTV-4AF found under Valve Angle by Armstrong Pumps Inc. The National Stock Number assigned to this part is 4820016659437, 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 FTV-4AF.