Orbit 67100 10-Count Multi-Stream Dripper Flow control knob adjusts water flow from 0 to 16 gallons per hour at 25 PSI Works with either 1/4-Inch tubing or easily threads into a standard 10-Inch to 32-Inch threaded adapter Works with most existing drip systems At a 3' maximum spray radius Flow control knob adjusts water flow from 0-16 GPH at 25 PSI