Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4820-1864 found under Valve Ball by Porter Manufacturing Corporation. The National Stock Number assigned to this part is 4820015956767, 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 4820-1864.