Key features and benefits - adjustable water flow: hose length is manually cut to set the water level and flow rate precisely - compatibility: suitable for refilling water in aquariums with cylinder wall thickness of 5/6 mm and 8 mm; uses a cola bottle according to international standard - low noise operation: built-in noise suppression device helps reduce operating noise; note: some details may not be fully specified - flexible mounting for walls of 8 mm: designed to be used on aquarium walls up to 8 mm thick and offers two settings for 5 mm and 6 mm wall thickness - differential pressure tube: cut into a long and a short section; the water end has an angled mouth; the short section defines the highest water line - automatic stop feature: when the short tube is fully exposed to the liquid surface, the unit refills water and the short tube stops refilling How it solves problems - Maintains stable water level by controlled top-off, reducing risk of overflow during evaporation - Provides a simple, standard-requirement refill method compatible with common cola bottle sizes - Reduces noise during operation for a quieter aquarium upkeep 2-3 use scenarios - Daily top-off for small to medium aquariums: trim hose to achieve a steady refill as water evaporates - Refilling tall or thick-walled tanks: install on walls up to 8 mm thick with the appropriate setting for 5/6 mm walls - During water changes or maintenance: the differential pressure tube design helps control refill to prevent overfilling while maintaining desired surface level Note: The description reflects the original specifications and functionality without adding or omitting key details.