8 ft. Double 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 double water tubes will provide more weight than single tubes to virtually eliminate the winter cover from moving, yet will not damage your valuable winter cover like bricks or other heavy objects.