Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SG3840 found under Valve Regulator Ass by L Tec Welding And Cutting Systems. The National Stock Number assigned to this part is 4820010879895, 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 SG3840.