The SIMPSON Dial-N-Wash is built to select the correct pressure for the desired cleaning application with a simple twist. The 82235 nozzle is uséd to clean hard surfaces such as, brick and concrete siding on its higher-pressure setting, and clean fences, decks, and wood siding by twisting to its medium setting. It even cleans the delicate surfaces of boats or vehicles by twisting to its lowest pressure setting. Our Dial-N-Wash is universal to fit most pressure washer standard spray wands and standard guns with threaded fittings.