Convert your existing sprinkler system to a low flow watering system with the Adjustable Flow Bubbler. Built-in 10-32 threaded inlet attaches directly to the rigid riser. Easily control the water flow by turning the knob to the amount of water you prefer, from shutoff position up to 11.7 GPH, and up 16 in. radius at pressures between 15-50 PSI. 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. Bubbler is made of polyethylene treated with UV inhibitors.