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The 25-degree nozzle is a flushing nozzle. This guy has a narrower spray pattern and more concentrated spray pressure than the 40-degree nozzle.
The 25-degree is best suited for flushing dirt, mud and grime. You'll find it comes it works best for wet-sweeping leaves from walks, curbs, and driveways, cleaning stable floors, washing swimming pool bottoms and blasting barbecue grills.