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This is the APU Condenser that mounts on the back of a truck's cab or sleeper. It has small holes in the back that you tap out to your desired size and mount anywhere on your truck you feel like it. See my shop for the APU Power Unit. You will find small holes in the end of the Condensor and the Power Unit, you can use wire t represent the lines that connect them. This unit fits Tamiya (or similar) 1/14 scale RC Semi Trucks