8 ft. Single Water Tubes are the perfect way to keep your winter cover securely in place throughout the winter months, ensuring a smooth, easy Spring opening. Its thick 18-gauge sheeting will not crack, split or puncture like thinner 14 or 16-gauge alternatives to give you years of service, and it uses Halkey Roberts™ no-leak valves that can easily be filled with a garden hose. Best of all, these water tubes will not damage your valuable winter cover like bricks or other heavy objects, saving you money.