Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1813 31 Y1 C found under Filter Indicator Li by A P M Hexseal Corporation. The National Stock Number assigned to this part is 6210013565932, and the Federal Supply Class is 6210 Indoor And Outdoor Electrical Lighting Fixtures. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1813 31 Y1 C.