The Rain Bird 1/2 in. Pressure Compensating Emitter Tubing works like a soaker hose — only better! It waters evenly from beginning to end. It won't clog and connects easily to your faucet, garden hose or existing underground sprinkler head. Emitter Tubing waters plants uniformly with pre-installed, pressure compensating emitters spaced every 18 in. The emitters are designed for clog-resistant flow at 0.9 GPH (gallons per hour) to ensure even, reliable watering.