If you thought setting up a drip irrigation system is time consuming and a lot of hard work, think again. The Adjustable Flow Bubbler Assembly comes preassembled for a faster install. The 4-stream bubbler emits water in half-circle pattern at up to 13 GPH and radius of up to 3 ft. (at 15-50 PSI). Dial allows you to control output with a twist. Bubbler and tubing are made of polyethylene; stake and connector are made of ABS; all materials treated with UV inhibitors.