Automatic water refill accessory for aquariums - Purpose and operation: This device provides automatic top-off water for your aquarium. It uses a short tube that, when fully submerged at the liquid surface, replenishes water and stops once the tube is no longer at the surface. - Compatibility and mounting: Designed for aquarium walls with thickness options of 5 mm, 6 mm, and 8 mm, with two fitting states to accommodate 5 mm or 6 mm walls (adjustable to fit different wall thicknesses as described). It is compatible with standard bottle-based reservoirs. - Reservoir and threading: Requires its own refill bottle. The product thread is suitable for domestic Coca-Cola bottles, enabling easy use with common beverage bottles as the water reservoir. - Hose length and adjustment: The length of the intake hose is manually cuttable, allowing you to set and fine-tune the water addition rate to match your tank needs. - Refill bottle included: Comes with an International Standard Cola Bottle, serving as the reservoir for refilling water. - Use scenarios: - Small to medium freshwater tanks: install on a 5–6 mm thick glass wall; adjust hose length for gentle, steady top-off as water evaporates. - Planted tanks with higher evap rates: use the 8 mm compatibility setting to maintain a stable water level without frequent manual refills. - Temporary setups or QT tanks: quickly deploy using a common cola bottle as the refill reservoir for easy transport and reuse. - Customer value: Provides a simple, self-contained top-off solution that reduces manual maintenance, uses widely available cola bottles for the reservoir, and offers adjustable flow to suit different tank sizes and evap conditions.