DONGKER 2 PCS CO2 1 Way Check Valves,CO2 Stainless Steel Non Return Valve for Line 4/6mm Tubing Regulator Diffuser Aquarium Systems

Stainless Steel Material:High Pressure Resistance, Acid and Alkali Resistance Small and Exquisite, sturdy, 1-way Check Valve Can Prevent Water From Flowing Backwards High Performance: 1-way Air Valve to Prevent the Reverse Flow of the Water Plant Tank Due to the Reduction of CO2 Pressure, Which Will Affect the Function and Service Life of the Cylinder Installation Is Simple: just Follow the Direction Indicated By the Arrow to Connect With the Trachea,The Check Valve Can Ensure that the Water and Air Circulations Are Consistent and Going in the Right Direction Without Any Backflow For CO2 Systems Only: the Total Length Is About 4CM, Suitable for CO2 Supply Systems,suitable for Standard Aquarium CO2 Trachea (trachea Inner Diameter 4mm, Outer Diameter 6mm) SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Contact Us.We Will Provide After-sales Service Until You Are Satisfied.