Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2333B-4PP found under Valve Check by Circor Aerospace Inc. The National Stock Number assigned to this part is 4820004899900, 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 2333B-4PP.