From the Manufacturer - Use this versatile staked riser with 360 degree Micro-Bubbler (adjustable for flow, distance and height) to apply water-saving drip irrigation in more places around your landscaping. Micro-Bubbler applies water similar to a spray head on an underground system projecting 8 streams of water in a full circle pattern. Easily directs water exactly where you need it in a wide variety of planting areas. Ideal for taller plants such as shrubs and bushes, excellent for use in flower beds, mass plantings and ground cover where you may require broader coverage. Radius and flow rate from 0 to 13 gallons-per-hour. The riser adjusts up to 18 in. in height and includes a sturdy 8 in. plastic stake. Pre-attached 36 in. length of 1/4 in. tubing with barbed fitting included for quick attachment to 1/2 in. drip irrigation tubing. Simple to insert by hand or use the Rain Bird hole punch tool - HPUN1-1S (sold separately) for faster installation in larger projects. Rain Bird "The Intelligent Use of Water".