Watering an irregular shaped lawn can be tricky, but the GroundWork 9-Pattern Metal Sprinkler is up for the challenge. That's because it features a patented pop-up rotor that helps achieve uniform watering. When this function is ON, the rotor pops up to provide uniform spraying. When the function OFF, the rotor retracts to protect the sprinkler housing. Built from durable metal and with 9 spray patterns to choose from, this lawn sprinkler can withstand wear and tear and make it easy to get the watering your landscape needs.