Mine has a square air box with depressed area where a threaded shaft sticks through the cover in the center of the depressed area. There is a wingnut that screws down on the shaft. Water gets funneled down into the depression, past the wing nut and into the air box onto the Air filter cover (which was covered with "white corrosion" when I got it). I just slid an Oring down the shaft with a washer and that sealed it up when I cranked down on the wingnut.