Get precise, even watering to your plant with the 1/2 GPH Pressure Compensating Dripper. PC emitters deliver the same output of water even when the water pressure varies, and maintain the same flow rate no matter where the emitter is located along tubing. The self-cleaning emitter with turbulent flow design flushes out sediments to reduce clogging. Use with 1/4 in. tubing branching off a larger supply line, or attach directly into larger supply tubing to irrigate shrubs and trees in landscapes & plants in container pots and hanging baskets. Emitter is made of polyethylene and silicone treated with UV inhibitors.