Excel PC CV pressure compensating (PC) dripline is designed with floating diaphragms, with built in check valve, that regulate and maintain a consistent flow rate at variable inlet pressures in a wide range of demanding conditions. The dripline drip emitter’s check valve feature prevents water draining when water pressure drops below 2.5 PSI, protecting the drip line drip emitters from siphoning sediment, soil particles, and debris at the end of each irrigation cycle.