Winter protection for pool skimmer housing - The skimmer cap prevents cracks in the skimmer housing during freezing by sealing gaps and using a freeze-compensator to limit the expansion of frozen materials, protecting the unit. Durable construction - Made from high quality ABS material, designed to withstand harsh winter conditions and provide lasting performance year after year. Wide compatibility - Fits skimmer openings of 3.8 cm and 5.1 cm, suitable for most pool skimmers including larger and deeper models. Easy to install - Before installation, drain the pipes completely to avoid water movement during winter. Then simply snap the cap into place to secure protection. 2-3 practical use scenarios - Scenario 1: Local winterization of a residential pool in regions with freezing temperatures, preventing skimmer damage. - Scenario 2: Seasonal pool closure for travel or storage, enabling a quick, reliable protection solution. - Scenario 3: Upgrading protection on pools with large or deep skimmers, offering a universal addition to existing equipment. Key attributes - Function: Provides winter protection and freeze expansion control for pool skimmers. - Compatibility: Works with 3.8 cm and 5.1 cm skimmer openings. - Size and fit: Designed to accommodate most deck- or floor-level skimmers with larger openings. - Material: High quality ABS for durability and resistance to winter conditions. - Performance: Reliable protection to help prevent cracks and maintain skimmer integrity during freezing temps.