Netafim™ Self Piercing Pressure Compensating Emitters have a 1.74 psi internal check valve that helps prevent low emitter drainage holding back up to a 3.9 foot column of water. Prevents contaminants from being drawn into the emitter. The Self Piercing Emitters are pressure compensating and delivers the same flow from 10.15 to 58 psi. Exclusive TurboNet® flow path design regulates flow and provides continuous self-cleaning action during operation. A sharp barb makes it easy to install, no tools required.