The Toro Turbo-Key non pressure compensating dripper is a popular choice among gardeners. The take apart feature makes on-site inspection and cleaning a breeze. The large turbulent flow path reduces clogging even in less than optimal water conditions. Used for short runs over level terrain. Available in three popular flow rates. The barbed inlet can be inserted directly into a hole punched in 1/2" or larger poly tubing or inserted into the end of 1/4" micro-tubing. Features: UV and chemical resistant for longer life; Cleanable; Self piercing barb; Color coded internal disc for flow identification 0.5 GPH - White; 1.0 GPH - Black; 2.0 GPH - Green; ; Please Note: Non Pressure Compensating drippers will flow at very low pressure rates, but will not regulate at the stated GPH flow until approximately 10 PSI. The fixed rate (non pressure compensating) drippers will vary their output per the operating pressure. See specifications in the manufacturers product details linked above.