Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7000-C31 found under Indicator Vertical Velocity by United Instruments Inc. The National Stock Number assigned to this part is 6610013759516, and the Federal Supply Class is 6610 Flight Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 7000-C31.