I got a new refrigerator and I'd like to connect water to it. There's an existing PEX line that runs from an old RO appliance up to the refrigerator location that I'd like to repurpose, as I no longer want to use the RO appliance. In the basement, I found a cold water line with 1/4" fitting (see circle 1 in attached photo), and the PEX line runs right by it with a connector (see circle 2 in attached photo). How do I go about connecting these together? I'd also need to connect the PEX line to the refrigerator upstairs via the braided water line with 1/4" fitting (see fridge_connection photo). Any advice is much appreciated!