Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 638413 found under Valve Bleeder Hydraulic System by H M Plant Limited. The National Stock Number assigned to this part is 4820002744510, 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 638413.