A tee of 13.5mm flat wire pigtails with the power connection passed through from the power injection wires to the output but no connection to positive on the input connector.
Input end: male connector with nut (end with exposed pins)
Output end: female connector with thread (end with holes)
The cable is marked with a label to indicate that the power connection connects the output and injection wires but the input positive isn’t connected.
AKA Ray Wu pigtails.