Type II pool filter cartridge: Made of high-strength ABS material. The filter core, center rod, and cap are glued together to ensure a better seal. The opening is injection molded, with high strength, thickened filter membrane, and greater suction capacity. Size: This filter is specially designed for the Bestway II. Pool Filter Size: Approx. 106mm outer diameter, 52mm inner diameter, 136mm height, please check your pump model before purchasing. Efficient: Changing the filter element is suitable for 300 gallons per hour to ensure the filter pump runs more efficiently. Keep your pool or spa clean and healthy. Captures Dirt: The opening is injection-molded, with high strength, thickened filter membrane, and stronger suction capacity. The filter element is mounted in the filter pump and captures dirt as it passes through the system, helping to remove dirt and providing clean, fresh water. Easy to clean: replace the filter cartridge every two weeks for maximum efficiency. Easy to clean, if