HPI pool Product 1' x 10' Blue 20 Gauge Water Tubes Swimming Pool Winter Covers USE THE DROP-DOWN AROW TO SELECT THE QUANTITY OF TUBES Our Water Tubes from are the best way to keep your pool cover secure all winter long. The water tubes are manufactured from quality heavy gauge vinyl treated with UV inhibitors and anti-bacterial and anti-fungus additives. They are designed to withstand sub-zero temperatures. Follow these simple steps when using water bags: Fill water bags 1/2 to 3/4 full to allow room for expansion due to freezing.  If you are having trouble closing the valves on your water bags - try this trick! Soak them in warm water and they will close easily. Heavy-duty 20 gauge vinyl Each water tube measures 1' x 10' ft long and is a double chamber water tube Just use a garden hose to fill water tubes (remember only fill half way to allow for ice expansion) U.V. Treated Color: Blue