Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50B-4KG1 found under Valve Regulating Fl by Griswold Industries Co. The National Stock Number assigned to this part is 4810016312626, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 50B-4KG1.