Anybody have experience with these? I have a copper ice maker line that I need to repair and the guy at Lowe's said they are the best thing ever. I have not connected it yet. I couldn't get the copper line to push into the coupler. Do I need to remove the little sleeve thingy from the coupler? This is what I bought. https://www.lowes.com/pd/SharkBite-...-Connect-dia-Coupling-Push-Fitting/1000192625 Maybe I need the 5/16 rather than the 1/4?