Check Valves (one-way valve) are made to prevent water back-siphoning down your air-line when there is a power outage. Back-siphoning is extremely dangerous and can ruin your air pump, empty your aquarium, damage your floors and create a shock hazard.Key Features: Small and Compact Fits standard aquarium air-line 4mm inner diameter Allows air to travel in one direction only. Stops water coming back down the air tube Easy to install - just cut the airline between the air stone and the air pump and insert check valve into air line
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