Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 125-0003 found under Regulator Thermostatic Temperatu by Richards Corp. The National Stock Number assigned to this part is 4820013997462, 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 125-0003.