Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P420 044 found under Valve Ball by Ernst John C And Co Inc. The National Stock Number assigned to this part is 4820015830697, 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 P420 044.