Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4050 found under Ring by Crane Pumps And Systems Inc. The National Stock Number assigned to this part is 2930004150351, and the Federal Supply Class is 2930 Engine Cooling System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4050.