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The brushes that encircle the outer ring are simply to keep the water from spraying out. It's much much faster than using the wand. Now it pushes more pressure (2400 psi) to get the job done faster and bette.
This attachment is a huge time saver and really does work. Just remember not to go fast. Recommended for the money.
Advertised as being compatible with up to 4000 psi. Opened box and only rated for 3100 psi. Waited 2 weeks for delivery only to see max 3100 psi clearly written on the box.