Raindrip Full Circle Adjustable Bubbler 5" Stake-Stream Spray (5 Pack) Converts existing 1/2 inch underground sprinkler systems to low flow watering where a drip circuit can't be set up Bubbler flow rates are adjustable from 0 - 13 GPH at 30 psi Adjustable bubbler rotates easily to preferred water flow - from full coverage for shrubs and large Potted trees to shut-off position Barbed connector attaches 1/4 inch Tubing to this sturdy, easy-to-plant stake Built to last