Lawn Sprinkler Trimmer-Fits Standard 2-1/4" Sprinkler Heads The SprinklerShark is an easy to use lawn sprinkler trimmer. It's the best way to maintain your standard 2-1/2" in. or smaller diameter pop-up sprinkler heads. This tool makes trimming around lawn sprinklers fast, safe and easy. Just center the cutting head over the sprinkler head. Put your foot in the stirrup, step down and lift up. It's that easy. Then dispose of the over-growth.