Aquarium Airline Check Valve with Duckbill Insert

Overview

• This aquarium airline check valve allows air to flow from the air pump toward an air stone or diffuser while helping block reverse flow. It helps reduce the risk of aquarium water siphoning back through the airline when the pump is switched off or power is interrupted.
• The transparent housing makes the red silicone duckbill insert visible. The flexible insert opens under forward airflow and closes against reverse flow, providing a compact backflow barrier within the airline.
• Approximately 50 mm long, the valve connects inline with 4 mm aquarium airline tubing. Bulk packaging contains 200 valves per bag for convenient stock handling and distribution.