Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D1831 1 1 2IN found under Valve Stop Check by P J Valves Inc. The National Stock Number assigned to this part is 4820010214618, 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 D1831 1 1 2IN.