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Aquarium Air Check Valves

When air pump is installed below water level, check valve must be in use in order to prevent the siphoning of water into the pump in the event of power outage.
Air Check Valve
by TOM Aquarium Products
$1.95

Air Check Valve by Penn-Plax
$1.95

Check Valve by Won Brothers
$1.49

Elite Air Check Valve by Hagen
$2.19