To begin with, you needn't feel ashamed if you have to use a dual lance. It happens to the best pressure washer pros whenever they have to switch back and forth between two types of nozzles. For example, one nozzle could be 15 degree angle, and the other a soap nozzle. There are probably as many combinations as there are applications. The dual lance is equipped with a rollover valve that makes it easy to switch between the two nozzles. Just release the trigger and tilt the gun in the direction of the desired nozzle. When you hear the ball change pipes, you're ready to pull the trigger. Some dual lances have a pressure adjustment knob so you can regulate the pressure as needed. There is a type of dual lance that does not have a valve between the two lances. This unit fires both nozzles at once, so to speak, and cleans a wider path by allowing full flow through both pipes simultaneously.
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Need a little more scrubbing power? Want to increase your cleaning efficiency?
Ultimate Washer offers a variety of Rotary Nozzles from which you can choose. Your cleaning time can be cut in half with the addition of this nozzle. These nozzles rotate at high speeds to increase the intensity of the spray. They can remove rust, graffiti, and barnacles from the bottom of boats just to mention a few. They can be used on pressure washers with as little as 3000 PSI up to the super heavy duty pressure washers whose PSI reaches 5000 PSI. Find more info at http://www.ultimatewasher.com/pressure-washer-rotary-nozzles.htm