Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D841-3031D found under Valve Regulating Fl by Cold Llc. The National Stock Number assigned to this part is 4820014821276, 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 D841-3031D.