4 ft. Blue Double-Chamber Heavy-Duty Water Tubes for In-Ground Pool Covers (5-Pack)

Robelle 4 ft. Double Water Tubes are constructed of heavy-duty 16-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.