Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 42 AR 37 120 AC found under Stem Fluid Valve by Magnatrol Valve Corporation. The National Stock Number assigned to this part is 4820014401343, 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 42 AR 37 120 AC.