Rain Bird PRS05030S Drip Irrigation 30 PSI Retrofit Pressure Regulator for 1/2" Threaded Riser Easily converts a 1/2" riser or existing shrub spray to low volume Drip watering system Provides 30 PSI pressure regulation for best performance of micro-watering devices Designed for use with free flow Drip irrigation manifolds Top outlet accepts a 1/2" threaded Drip manifold (sold separately) Use with Rain Bird free flow manifold models (sold separately): MANIFRE1S, MANIFRE4S, and MANIFRE6S Constructed of highly durable UV and chemical-resistant materials to assure long life