Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9MT-81SL-219 found under Receiver Transmitter Light Signa by American Fibertek Inc. The National Stock Number assigned to this part is 6030016199817, and the Federal Supply Class is 6030 Fiber Optic Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9MT-81SL-219.