0-20 GPH, Adjustable, 6 Outlet, Retrofit Drip Head, With 1/2" Female Pipe Thread, Use To Convert An Existing 1/2" Sprinkler Riser To A 6 Outlet Drip Zone, Each Outlet May Be Adjusted By Turning The Knob Under The Drip Head To Increase Or Decrease The Flow, Extend 1/4" Micro Tubing From The Drip Head To Plants & Secure The Micro Tubing With A 1/4" Stake & May Be Used With Other Drippers Or With 1/4" Laser Drilled Soaker Hose.