Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 223 1 1 4IN found under Valve Regulating Fl by Watts Regulator Co. The National Stock Number assigned to this part is 4820011832337, 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 223 1 1 4IN.