NON RETURN VALVES
Safeguard your aquarium products by using this simple piece of equipment. Your expensive air pumps can soon become damged if a powercut stops the air as water then siphons back down the airline into the pump. Normally this is terminal for your pump and also causes flooding in your house as the pumps are very rarely water tight.
But you can simply cut the airline and insert one of these on each line to avoid this. Also these allow you to safely install the pump below the waterline of your aquarium.
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