Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 55-1625 found under Drive Pin Pump by Mayo Company Inc. The National Stock Number assigned to this part is 4320011255381, 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 55-1625.