Products      Modular Group    Complete range of micro-sprinklers    and micro-jets.    427    1/2" Full- & Part-Circle    Plastic Impact Sprinkler.    421     Full-Circle Metal Impact Sprinkler.    423    1/2" Full & Part Circle    Metal Impact Sprinkler.	Topaz Full- or Part-Circle Plastic Impact Sprinkler. Whisper Quiet Full- or Part-Circle Gear-Driven Sprinkler.