【Prevent Algae Formation】: The 210D protective cover is made of high-density waterproof Oxford fabric, which helps reduce algae growth by reducing light. When exposed to the sun, it also helps warm the water. Even if the water tank stays outside all year round, you don't have to worry. 【PRACTICAL DESIGN】: The top of the lid and the side valves are designed with openings that allow quick opening and closing, so you can use it without disassembly. A traction rope has been added to the bottom to prevent it from being blown away by the wind. 【APPLICABLE PRODUCTS】 This IBC tank cap is suitable for IBC tanks with a capacity of 1000 liters and dimensions 116 x 100 x 120 centimeters. Note: The data are all measured manually, please allow an error of 1-3 cm due to differences in light and display, there may be color differences, please refer to the actual item received.