Check valve set, sera 29239, 2 pieces

The sera check valve set (2 pieces) provides a compact solution to allow unidirectional flow and prevent backflow in aquarium and pond plumbing systems. Each valve is a plastic inline fitting designed to be installed directly into standard tubing and return lines. The set is intended for use where accidental siphoning or reverse flow could damage filters, pumps or CO2 systems; it enables safer maintenance and reduces the risk of water loss or equipment failure.

Advantages

These check valves offer a simple, space-saving design that fits common tubing sizes and installs inline without special tools. They work automatically, allowing flow in one direction while preventing backflow when the downstream pressure drops. The plastic construction is lightweight and resistant to typical water conditions found in aquariums and garden ponds, providing a cost-effective method of protecting pumps, filters and gas systems from siphon-related issues.

Suitable for

• Inline return lines for aquarium filters and external canister filters
• Pond pump return circuits to prevent backflow during power outages
• CO2 supply lines and dosing systems to avoid reverse gas or liquid movement
• Air pump and aeration lines where one-way flow is required

Key specifications

• Quantity: 2 pieces per set
• Material: durable plastic suitable for freshwater and pond use
• Type: inline non-return (check) valve for tubing installations
• Installation: inline insertion into flexible tubing or return lines
• Operation: allows flow in one direction and prevents backflow automatically

How to use

Cut the tubing at the desired location and insert the check valve inline, ensuring correct orientation so that the arrow on the valve corresponds with the intended flow direction. Push the tubing fully onto each end of the valve to create a secure fit; use hose clamps if needed for larger or high-pressure lines. After installation, run the pump or system to verify uninterrupted forward flow and confirm that no reverse flow occurs when the downstream circuit is depressurized.

Usage recommendations

Regularly inspect the valve for debris or buildup that could impair sealing. Clean or replace valves if you notice reduced flow or intermittent backflow. For long-term reliability, avoid exposing the valve to strong solvents or prolonged direct sunlight; in systems with high pressures or unusual tubing sizes, select appropriately rated fittings or add hose clamps to ensure a secure connection.