Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 22001 found under Diaphragm Valve Flat by Hydraulics International Inc. The National Stock Number assigned to this part is 4820011038097, 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 22001.