Bowsmith Non Clog Dripper Emitter 3.0 GPH Yellow (1000pcs/Pack)The Bowsmith NonStop Emitter design, patented in 1974, is based on a simple unique principle found in no other emitter. This Pressure Cascade Principle permits the emitter to tolerate large amounts of suspended solids in irrigation water, without clogging and without the need for fine mesh filter screens. For over 40 years, millions of Bowsmith NonStop emitters have demonstrated that the unique NonStop Continuous Self Cleaning Action (Pressure Cascade