Rain Bird Landscape Dripline System MBUB-F-2PK 360 Degree Full Circle Threaded Micro Bubbler 2-Pack. Water-efficient low volume streams directed in a full circle pattern. Uniform 8 stream threaded micro bubbler provides excellent distribution. Ideal for watering shrubs, trees, container plantings and flower beds. Adjust flow/radius by turning outer cap. Easily threads onto Rain Bird riser stake RISER-1PK with 10-32 self-tapping threads (not included). Adjustable flow rate from 0 to 13 GPH. Pressure 15 to 30 psi. Spray radius from 0 to 3 feet. Clean by completely unscrewing cap from base unit. Convenient re-sealable plastic bag contains 2 bubblers.