Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81761C found under Manifold Water Outl by Hercules Engine Co Inc. The National Stock Number assigned to this part is 2930004139849, 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 81761C.