Stainless Steel CO₂ Check Valve

Prevent backflow and protect your CO₂ system with this compact stainless steel check valve. Designed for pressurized aquarium setups, it ensures reliable one-way flow while keeping moisture out of your regulator and solenoid.

💡 Note: These are not recommended for air pump use. The spring pressure may be too strong for standard air systems.

Key Features

• Durable Stainless Steel Construction – Corrosion-resistant for long-term aquarium use

• One-Way Flow Design – Stops backflow and protects sensitive CO₂ gear

• Standard Fit – Compatible with 4/6 mm aquarium CO₂ tubing

• Easy Inline Installation – Arrow indicates flow direction for quick setup

Specs

• Material: 304 stainless steel

• Tubing Compatibility: 4/6 mm soft CO₂ tubing

• Valve Type: Spring-loaded one-way

• Application: Pressurized CO₂ systems only (not for air pumps)

Q&A

Q: Can I use this valve with an air pump or air stone?
A: This check valve is intended for pressurized CO₂ systems and may not open reliably under low-pressure airflow. For air pumps, a softer diaphragm-style valve is recommended.

Q: Which way should the arrow point?
A: The arrow should always point in the direction of CO₂ flow — from the regulator toward the diffuser.