Gilmour Extra Large Coverage Impulse Sprinkler 998ZS Extra large water jet for 50% more coverage than standard impulse heads. Trip lever for full or partial coverage with reversing full circle setting. Deflector dial to set distance. Patented impulse arm saves water by eliminating back and side splash. Diffuser screw allows for easy fingertip adjustment of water stream for even coverage. Impact resistant, rustproof polymer head construction. Three prong spike with extra-wide foot step and heavy-duty die cast zinc base.