Rainbird 1800 Series Pop-Up Spray Head with Seal-A-Matic and Pressure Regulator Without Nozzle, 12" 12 in. 1800 Series pop-up spray head with Rain Bird Flow Optimizer Technology and Seal-A-Matic Check Valve PATENTED PRS pressure regulator built into the stem Restricts water loss by up to 70% if nozzle is removed or damaged - Saves water and money Reduces possibility of accidents and property damage Designed for use with all Rain Bird plastic spray head nozzles