Winter Block Above Ground Pool Winter Air Pillow - Heavy Duty, Cold Resistant Cover Float for Winterizing & Closing Aboveground Pools, 4’ x 4’, 4-pack

PROTECTS ABOVE-GROUND POOL WALLS: Our pool pillow creates surface tension which allows your pool to freeze outside in instead of inside out. The ice expansion squeezes the pillow instead of the pool walls. PROTECTS ABOVE-GROUND POOL COVER: The pillow pushes your pool cover up off the water's surface so the water won't freeze to your pool cover. It also keeps water off the top of your pool cover EASY ASSEMBLY: A double valve, allows inflating and deflating faster. It allows air flow into the pool pillow without the loss of air. STAYS IN PLACE: This pool winterizing pillow features reinforced grommets at each corner to keep the pillow in position at the center of the pool. Just slip a rope through and tie the pool pillow to your aboveground pool. It is recommended to inflate 60% to 70% of the total volume to allow expanding ice to squish the pillow rather than push against the pool walls