Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1000101-20IN found under Valve Check by Robert E Krueger Manufacturing And. The National Stock Number assigned to this part is 4820011457631, 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 1000101-20IN.