- Adjustable Length: The manually cut hose allows you to tailor the water level in your aquarium to your preference. - Compatibility: Designed for aquarium walls with a thickness of up to 8 mm. It features two settings suitable for wall thicknesses of 5 mm and 6 mm. Simply trim the differential pressure tube (the water end has a slanted opening) to achieve your desired length. - Easy Water Refilling: When the shorter tube is fully submerged in water, it automatically refills your aquarium. Once the water reaches the top of the shorter tube, the refilling stops, ensuring optimal water levels without overflow. - Universal Fit: This product accommodates water refilling in aquariums with cylinder wall thicknesses of 5 mm, 6 mm, and up to 8 mm. It is compatible with standard cola bottles as per international specifications. - Custom Water Bottle Required: The product requires a separate water refill bottle. The thread is designed to fit most domestic soda bottles for your convenience. Use Scenarios: 1. Ideal for maintaining consistent water levels in home aquariums, ensuring fish and plants thrive. 2. Perfect for quick water changes during tank cleaning, minimizing stress on aquatic life. 3. Convenient for hobbyists with multiple tanks, allowing for efficient water management across setups. This reliable and practical water refilling solution is essential for any aquarium enthusiast looking to simplify tank maintenance.