MiOYOOW Check Valve, Anti High Pressure Fish Tank Air Pump Valves for Backflow Return CO2 Line 4 mm Hose Regulator Diffuser

【Avoid Backflow】: 1-way non-return valve with anti-leakage and anti-backflow function avoids water from flowing back into the aquarium CO2 system. 【High Quality Aluminium Alloy】: Check valve's main body is made of aluminium alloy with CNC machining process, and the surface is sandblasted and anodized, which is not easy to rust. 【2-Way Locking Design】: The locks on both ends of the CO2 non-return valve fix the CO2 air tube to prevent it from falling off at high pressure. 【Compact Appearance】: Fish tank air pump valves length is about 3.7cm, outer diameter is about 1.5cm. 【Simple Installation】: Connect the gas tube according to the arrow pointing to the direction of gas flow, 1 end connects to the inlet and the other end connects to the outlet tube.