These Double Water Tubes by PolarShield efficiently secure your winter pool cover tightly around your swimming pool. These water tubes are more stable beneath your pool cover and provide you with dependability you’ll love. Double Water Tubes use two chambers so that if one bursts or tears, the other continues to keep your pool cover secured. Our rugged water tubes won’t split like thinner bags as these are 33% heavier than the standard tubes. Its quality Helkey Roberts no-leak valves make it easy to fill with a garden hose. Use these Double Chamber Water Tubes to keep your pool area safe and secure during the winter season.