Robelle 8 ft. 6-Pack Extra Heavy Duty Black Double Chamber Pool Cover Weights, .42 MM Thick Vinyl, Pool Water Bags, Water Tubes

8' Double Chamber Black Water Tubes are constructed of heavy-duty 20 gauge, puncture resistant vinyl. All of our water tubes have a conveniently placed, leak-proof valve that is easy to fill with a garden hose. Water tubes keep your pool cover in place all winter long. Water tubes should be filled half-way to prevent popping caused by expansion if the water freezes. 6 Pack.

• 6-Pack Black Extra Heavy Duty 8 ft. Double Chamber Pool Cover Weights for Winter Pool Closing
• Extra Heavy Duty .42 MM Thick Vinyl constructed 163% heavier than industry standard.
• Since 1973 Robelle has been making the best products to close your pool. Use the best pool closing products designed with over 50 years of experience.
• Prevents Winter Pool Cover From Falling Into Pool.
• Double Chamber Design Prevents Rolling.
• Fill Halfway With Water to Allow For Ice Expansion.
• If you have trouble closing the valve please use a hair dryer to loosen before closing.