Here is a shortcut for the old 18.5 model: Home Depot --> 14" clay saucer --> Put saucer in Bullet water pan --> Cover saucer with at least one layer of heavy duty tin foil, wrapping the edges around sides of the water pan --> Replace foil when it leaks. Has worked for me for several years and probably a hundred cooks. Less mess and trouble than water, sand, or any other method. I've tried them all. Just adapt to your model.