Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 994C25 21 found under Valve Shuttle by Zodiac Intertechnique Fuel. The National Stock Number assigned to this part is 4820144718880, 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 994C25 21.