Aquarium Accessories Fish Tank Air Pump Accessories Check Valve Anti-Backflow Anti-Siphon CO2

Aquarium Accessories Fish Tank Air Pump Accessories Check Valve Anti-Backflow Anti-Siphon CO2 System Suitable for 4mm Hose Product Check valve Item Aquarium Accessories Material Plastic Color Red Function Protective Gas Pump 1. One-Way Air Flow Design：Built-in red silicone diaphragm ensures air only flows from air pump to air stone, 100% prevents aquarium water backflow into the air pump, effectively extending pump service life and avoiding equipment damage. 2. Sensitive & Reliable：Instantly closes when air stops, no leakage, no water return, keeps your fish tank oxygen system stable and safe. 3. Suitable for 4mm hoseFits standard 4mm (0.16in) aquarium air hoses, compatible with most fish tank air pumps, air stones, CO2 systems, and aquarium accessories. 4. Transparent Visible Design：Clear housing lets you visually check the valve's working status at any time, easy to monitor and maintain.