8 and 9 outlet manifolds allow you to use different emitter flow rates from a single water source in your drip irrigation system. 1/4 inch micro tubing is used to run water directly to where it's needed the most, at the plant's roots. These multi-outlet manifolds available at Sprinkler Warehouse thread directly onto any 1/2 inch riser, allowing you to retrofit existing sprinkler systems into drip systems.