Bowsmith NonStop® 6080 FD2020 Red Drip Emitters Series 2000 Flow Distributor 2.0 GPH Flow Rate. For over 40 years, millions of Bowsmith NonStop emitters have demonstrated that the unique NonStop Continuous Flushing Action (Pressure Cascade Principle) really works, even under conditions that would quickly clog ordinary emitters. With only 30-mesh filtration, Bowsmith NonStop emitters have operated successfully with water containing heavy concentrations of sand, silt, iron bacteria "slime", calcium carbonates, even algae and moss.