Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AAA MODEL 277 found under Valve Linear Direct by Womack Machine Supply Company. The National Stock Number assigned to this part is 4820013205228, 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 AAA MODEL 277.