Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 420-0123 found under Plug Rotary Valve by Summer Equipment Ltd. The National Stock Number assigned to this part is 4820013338030, 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 420-0123.