Versatile: Winter pool plug is suitable for Intex pools up to 457 cm in diameter, Bestway pools with shut-off valves, and smaller pools with internal pump connections featuring an 83 mm external thread. Features: Winter closure set that is frost-resistant and watertight, helping prevent water from causing damage in pipes and protecting your pool during winter months. Quick Assembly: Simply screw the winter plug onto the pump hose threads for immediate freeze protection. Pool Winter Plug: This practical winter plug set allows you to safely prepare your pool for winter and confidently resume use in spring. Product Dimensions: Diameter approximately 9 cm (3.54 inches). Specification: Material: Rubber, Plastic Product Size: Diameter about 9 cm (3.54 inches) Package Includes: 1 x Winter Pool Plug with Matching Seal Note: Slight variations of 1-2 cm may occur due to manual measurement.