The tubing should have a diameter of 1/4-inch and can be copper line, braided steel line or plastic tubing. Many professionals prefer copper line, but plastic tubing is commonly sold as part of ice maker installation kits.

How big is a refrigerator water line?

Most flexible copper refrigerator water lines have an outside diameter of less than 1 inch. The outside diameter of most flexible plastic water lines is either 1/2 inch or 5/16 inch.

Are all refrigerator water lines the same size?

Tubing Sizes Most flexible plastic water lines for refrigerators come with outside diameters of either 1/4 inch or 5/16 inch, reveals Darrins Plumbing Tips. Check your refrigerators owners manual or the manufacturers website for the recommended size and type of water line for your unit.