Rain Bird Spray Heads have first-rate quality built in for reliable operation and long life. Their superior components and features make them the spray heads of choice for a wide variety of applications.  The Rain Bird 1800 Series Spray Heads and MPR Nozzles are installed by more contractors than all other brands combined.  This worry-free combination distributes water evenly, ensuring a consistently green lawn.  The 1800 Series are also available with Seal-A-Matic™ (SAM) in-stem check valve option and patented PRS in-stem pressure regulator option.