Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 203BP-2IN found under Valve Check by Core Industries Inc. The National Stock Number assigned to this part is 4820010217732, 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 203BP-2IN.