Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50M-2-91757F found under Valve Regulating Fl by Griswold Industries Co. The National Stock Number assigned to this part is 4820011568284, 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 50M-2-91757F.