Control the amount of water delivered to your plants with a twist of a knob using the Adjustable Flow Bubbler. Bubbler works from 15-50 PSI PSI to discharge 0-11.7 GPH with up to 16 in. radius. Water flow is easily adjusted to your preference by turning the dial from shut-off position to full coverage. The 8-stream emitter releases water in a full-circle pattern. Ideal for groundcover, decorative grasses, flower and vegetable gardens, as well as trees and shrubs. Built-in 1/4 in. barbed inlet fits into punched hole in supply tubing. Bubbler is made of polyethylene treated with UV inhibitors.