Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4B3040 found under Adapter Water Disch by Caterpillar Inc. The National Stock Number assigned to this part is 2930004239276, 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 4B3040.