The Dial-N-Wash allows you to easily select the correct pressure for the desired cleaning application with a simple twist! 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. Even clean delicate surfaces such as boats or vehicles by twisting to its lowest pressure setting. Our Dial-N-Wash is designed to fit most standard spray wands and standard guns with threaded fittings