Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W0403-58-01 found under Piston Valve by Rolls Royce Marine As Avd Norwinch. The National Stock Number assigned to this part is 4820251502059, 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 W0403-58-01.