With its drip stake this drip emitter is easy to insert into and retract from the ground. This drip irrigation emitter has a flow control knob to adjust water flow from � to 16 gallons per hour at a maximum water pressure of 25 PSI. For all your drip system irrigation needs this irrigation drip emitter allows for many uses in dripper irrigation. Features and Benefits: Comes in a pack of 2 Sits on a 6-inch drip irrigation stake Has an adjustable spraying radius from 2 to 6 feet Water flow control knob adjusts from � to 16 GPH (gallons per hour) Has a maximum allowable water pressure of 25 PSI.