Aqua Blocks Water Block Tubes — 12-Pack for Winterizing Swimming Pools (Not for Round Pools)

Not suitable for round swimming pools. Aqua Blocks™ water block tubes are molded from high-density black polyethylene for reliable winter protection. A built-in UV inhibitor helps prevent fading and cracking, while the low-profile, attractive shape is designed to blend with your pool edge. Each unit nests with the others for compact, space-saving storage. Inner dimensions: 36" L x 6" W x 4" H. Warranty: 5-year limited warranty.