Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 729-000-063 found under by Dr Ing K Busch Gmbh. The National Stock Number assigned to this part is 4820016644749, 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 729-000-063.