This spray head is easy to adjust even when the water is on. The pattern adjusting nozzle, allows easy water control and spray direction. It also features an anti-drain check valve for keeping the water from draining onto sidewalks, creating slippery hazards or wasting water. The 400 Series offers a molded, pressure activated wiper seal that stops excessive flow-by and cleans the stem upon completion of watering. The factory installed dual-port flush plug provides for easy clean out and easy access to nozzle installation. The body attaches to a 1/2 in pipe thread riser for easy installation.