A perfect addition to your pool winter kit, the Swimline 2 x 2 Corner Water Tube is an L-shaped pool weight that holds your swimming pool cover in place and keeps debris and leaves from falling into the water. The double heat-sealed seams with a quarter inch overlap and heavy-duty quality vinyl prevent any water leaks. The valve is leak-free too. It's large enough to accept a garden hose and quickly fills or drains the water tube. When filling the water tube, make sure to only fill it halfway so there's room for freeze expansion during the colder winter months. The Swimline 10 ft. Double Water Tube is made specifically for use with your rectangular or oval pool cover to eliminate stress on your pool and the cover. It's 33% heavier then other water bags, making it super durable and its valves are easy to fill up with a garden hose. This Swimline water tube is best used with in-ground pool covers. Covering your pool with a winter cover keeps out dirt and debris. This water tube helps keep the cover in place. Color: Blue. Material: PVC.