Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 331 100 641 found under Diaphragm Actuator Valve Special by Interspiro Inc. The National Stock Number assigned to this part is 4820013303303, 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 331 100 641.