Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 56T3 4 found under Valve Regulating Temperature by Flodraulic Group Incorporated. The National Stock Number assigned to this part is 4820010050167, 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 56T3 4.