Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21C7494P02 found under Adapter Test Pressure by Noel Smyser Engineering Corp. The National Stock Number assigned to this part is 4920012566998, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21C7494P02.