Check the listing for details. Netafim Self Piercing Woodpecker Pressure Compensating Junior Dripper PACK OF 50. Condition: New. Listed at 39.50 USD. Netafim Self Piercing Woodpecker Pressure Compensating Junior Dripper PACK OF 50 and FREE SHIPPING Netafim Self Piercing Pressure Compensating Emitters w/ Internal Check Valve - 2.0 GPH Red The Netafim Self Piercing Emitters have a sharp barb, making them easy to install, no tools required. These emitters have a 1.74 PSI internal check valve that helps prevent low emitter drainage holding back up to a 3.9 ft column of water. The anti-siphon operation prevents contaminants from being drawn into the emitter. The Self Piercing Emitters are pressure compensating and deliver the same flow from 10.15 to 58 PSI. Exclusive TurboNet® flow path design regulates flow and provides continuous self-cleaning action during operation. Recommended minimum filtration of 120 mesh.