6 New 1106 Swimline Winterizing Cover Blocks
Dimensions: 36'L x 8'W x 4'H
Easy to fill with sand or water
Replaces standard vinyl water tubes that end up needing replaced year after year
Each block is 3 feet long and should be spaced 5 feet apart. So take the circumference of your pool/8 for how many blocks you need

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ASIN : B009CJ8D22