Venus Aqua Aqua One Airline Check Valve for Large Aquarium Fish Tank Fish Farms Ponds Biofloc Seafood Restaurants (Pack of 2) Aquarium Tool
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Connect a check valve (one-way) to air line tubing to prevent water back down to your air line when there is a power off. Back-siphoning is extremely dangerous and can ruin your air pump, empty your aquarium, damage your floors and create a shock hazard. 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
