Bubble counter with backflow prevention.

Main Features:
• To adjust CO2 level: Bubble counter with backflow prevention for precise CO2 dosing in the aquarium.
• Fill the bubble counter with water, connect it via hose to the CO2 system and diffuser, and secure it outside the aquarium with two suction cups on the glass or screws on the furniture.
• Easy bubble inspection: CO2 bubbles are visible and countable, no backflow thanks to the check valve, suitable for all common CO2 systems.
• Reliable hose connection prevents accidental disconnection of the hose.