Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 321 06 104 found under Piston Pump by Vacuum Products Inc. The National Stock Number assigned to this part is 4320013154050, and the Federal Supply Class is 4320 Power And Hand Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 321 06 104.