Pool Mate 1-3809-20-BLK-05 Extra Heavy-Duty 20 Gauge 8-Foot Black Winter Water Bag For Swimming Pool Covers, 5-Pack

Pool Mate 8-Foot Winter Water Bags should be placed around the perimeter of your in-ground winter swimming pool cover. Simply slide these winter water bags through the water bag loops included on your winter pool cover. These water bags include leak-proof valves that are easy to fill with a garden hose. Only fill the water bag half-way, this prevents ice from expanding and splitting your water bag. Pool Mate water bags feature a dual-chamber design, preventing the tube from rolling into your pool during the winter. Made with Extra Heavy-Duty 20 gauge black vinyl. Safety Warning Only fill halfway to prevent ice expansion and splitting. If you have trouble closing the valve, use a hair dryer to loosen before closing.