Aqua One PVC Airline is designed to connect Aqua One Air Pumps and Airstones together.
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Use the Check Valve (also known as a Non-Return Valve) whenever an air pump is positioned on or below the waterline of the aquarium.
This will ensure that water does not siphon down into the air pump when the pump fails or when there is a power shortage.
Place the check valve in the airline that runs between the air stone and the air pump.