Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C2516 found under Valve Regulating Fl by Griswold Industries Co. The National Stock Number assigned to this part is 4820004130220, 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 C2516.