Aquarium Air Pump Check Valve

Prevent water backflow into your air pump with this reliable one-way check valve, designed to keep your aquarium and CO2 systems safe. Prevents water from flowing back into the pump or CO2 regulator Fits standard 4mm aquarium tubing for easy installation Durable plastic construction built for long-term use in wet environments Simple to install with clear directional flow orientation Ideal for aquarium air pumps, CO2 injection systems, and any setup requiring reliable backflow protection.