Woodpecker Pressure Compensating Junior Dripper - 1.0 GPH Grey (250pcs/Bag) The Netafim Woodpecker Junior Drippers have a barbed outlet and CNL check valve that helps prevent low emitter drainage. The anti-siphon operation prevents contaminants from being drawn into the emitter. These Woodpecker Drippers are pressure compensating and deliver the same flow from 12 - 58 PSI. The barbed outlet fits the Netafim Super Flex UV White PE Tubing.