Aqua One Air Line Check Valve 2pk
The Aqua One Air Line Check Valve Carded 2 Pack is easy and convenient to install so your aquarium can perform at its best. The Air Line Check Valve should be used whenever an air pump is positioned at or below the waterline of the aquarium. This will 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.