1/2 Inch Perma-Loc Coupling. Fits .6 inch inside diameter polyethylene tubing.
Do not require any glue or clamps to connect to hose. These fittings are the easiest to use- recommended if you have arthritis or less than macho strength in your hands. Also, these are easy to remove from hose for rearranging or reuse. Insert hose and spin fitting tight. Rovides very positive seal. The 600 series fits 18mm drip hose and 1/2" dripperline.