Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C80-1 1 2IN found under Valve Check by Newdell Company The. The National Stock Number assigned to this part is 4820011439022, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C80-1 1 2IN.