When I renovated my kitchen, I left the existing icemaker water line
in place. It is a 3/8" flex copper line. The old fridge had a 3/8"
compression connection. I've noticed that the newer fridges use a
1/4" line. I figured I could still use the existing line, just put in
a 3/8"-1/4" adapter. Any issues with using a 3/8" line?