Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 237AVL70237-131 found under Valve Regulating Fl by Singer Co The. The National Stock Number assigned to this part is 4820009093717, 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 237AVL70237-131.