Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B163.05201-217 found under Seat Valve by Leistritz Pumpen Gmbh. The National Stock Number assigned to this part is 4820012856124, 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 B163.05201-217.