Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D3 4IN 40T80PSI found under Valve Regulating Fl by Cashco Inc. The National Stock Number assigned to this part is 4820012787329, 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 D3 4IN 40T80PSI.