Wanted to wash all the sand and crud out of my air box and clean the filter but was concerned about getting water into the intake and the two breather tubes. Couldn't quite decide how to do it and keep the water out, but after looking around the garage, hit on the idea of using a throw away rubber glove that I keep around for changing oil, etc. I cut off two fingers and put one over each breather, held in place with a rubber band. I then use another one and put it over the intake opening. Worked pretty well.