Reduce and control water pressure for drip systems connected to a 1/2 in. riser. Provides an easy method of converting a shrub spray to water saving drip zone. Bottom inlet attaches to standard 1/2 in. threaded riser. Top outlet accepts a 1/2 in. threaded drip manifold from which you can run 1/4 in. poly tubing to drippers, bubblers, micro sprays and emitter tubing.