Get precise, even watering right to your plants root zone with the 1/2 GPH Pressure Compensating Dripper. PC emitters compensate for varying water pressures, uneven terrain, and location along tubing to maintain the same output of water. The self-cleaning emitter with turbulent flow design flushes out sediments that can lead to clogs. Use with 1/4 in. tubing branching off a larger supply line for plants in container pots and hanging baskets, or attach directly into larger supply tubing to irrigate shrubs and trees. Emitter is made of polyethylene and silicone treated with UV inhibitors.