Refrigerator Water Line Connector
Assuming you're in the US that line should be 1/4&quot;. For the braided line you want 1/4&quot; compression x 1/4&quot; compression. It will have a fitting at each end with a rubber washer built in and it will connect directly to the fitting on the fridge. The other end of that line in the photo will have the same fitting.
Google  &quot;1/4&quot; icemaker braided line&quot;