The Evolution RO1000 Orange Drain Elbow (HydroLogic number 14308) features a 1:1 ratio with a 3/8-Inch Quick Connect fitting. Save resources by cutting your waste water in half with this great add-on. The HydroLogic Flow restrictor elbow fits standard 3/8-inch water lines. Helps to customize your indoor hydroponic garden. Replaces standard Evolution RO1000 green drain elbow to save 50% of the drain water. Eco-friendly choice.