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PondXpert ElectroAir 4mm Check Valve
This Non Return Check Valve by PondXpert helps to control the flow of water into your pond or aquarium; restricting water circulation in one direction.
The Non Return Check Valve will:
Protect your pump from damage caused by back-siphoning as a result of accidental power loss;
Prevent water from siphoning through the airline.
This Non Return Check Valve has low resistance, so will not affect the air flow of your air pump and can be easily installed anywhere along the airline.