Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VTS 450D 580 0781 3909 found under Valve Regulating Fl by Victor Equipment Co. The National Stock Number assigned to this part is 4820012367202, 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 VTS 450D 580 0781 3909.