Dewitt® Dew Right Tree Water Bag 20gal Eliminate the severe water stress that new trees endure after transplanting. This tree watering bag is designed specifically to increase first-year survival rate and set the stage for a long, healthy life. 20gal bag empties in 5 to 8 hours and only needs to be refilled one or two times per week for most trees. Installs easily in just 5 minutes, without tools. A single bag fits trees up to 3in in diameter. Zip two bags together to fit a 3in to 5in diameter tree. Made from heavy-duty, green-coated polypropylene that is UV stabilized to last after long hours in the sun. Safe to use with nutrient or chemical additives.