Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P4CP4-K12-GR found under Valve Check by Olympus Ndt Ne Inc. The National Stock Number assigned to this part is 4820012271896, 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 P4CP4-K12-GR.