The Button Drip Emitters utilize a unique labyrinth flow path design, producing a turbulent flow for consistent operation with less chance of clogging. The drip emitters are available in flow rates of .5, 1 or 2 GPH and operate at 10 to 20 PSI. Specifications Flow rate and color code: 2 GPH (8 L/H) Color Code - Green Operating pressure: 10-20 PSI (.7-1.4 BAR) Available inlet: 1/4" barb Materials: polypropylene Filter requirement: minimum of 150 mesh Features Unique design with a minimum width passage of 0.043" provides a turbulent flow to prevent clogging Uniform flow rate Constructed of high-quality material to ensure stability and long life Color-coded to easily identify flow rate Raised barbed outlet prevents water runoff along the drip lateral Resistant to chemicals and fertilizers used in landscape applications Constructed of UV-resistant, durable plastic material to withstand the most adverse conditions