Aquarium Water Level Controller Auto Top Off Water Filler Compensator with Adapter, Suitable for Hatching Brine Shrimp Eggs, Abs, Ideal for Fish Tank Maintenance, Aquarium Accessories

Automatic Top-Off, No Power: Uses a pressure-difference design to add water as it evaporates—no pump or electricity—keeping the waterline steady and parameters stable.

Stable Salinity for Marine Tanks: For reef/marine setups, top off with RO/DI freshwater (not saltwater) to replace evaporation and help maintain consistent salinity between water changes.

28-mm Bottle Ready: Works with most standard beverage bottles with a 28 mm neck; choose bottle as the reservoir and check remaining water at a glance.

Quick Clip-On Install, Fits 15 mm Walls: Mounts on glass/acrylic up to 15 mm (~0.6"); height-adjustable outlet lets you set the exact water level. Tool-free setup and removal.

Durable ABS, Low-Maintenance: Corrosion-resistant ABS body with no moving parts for quiet, reliable operation; suitable for freshwater and saltwater tanks—just rinse during routine care.