These low volume sprinkler heads are ideal for watering flowers and shrubs. The flow control knob adjusts water flow from 0 - 29 gallons per hour at 25 PSI. Emitter works with either 1/4 in. tubing or easily threads into a standard 10-32 in. threaded adapter. This product is universal it works with most drip systems. 10 ft. maximum spray radius. Quarter spray pattern.