Tunze Osmolator 3155 - Auto Top Off System The Tunze 3155 Osmolator is one of the best ATO systems in the aquarium hobby, and is trusted and used by almost all the best saltwater setups around.  Tunze's Osmolator is...

Tunze Nano Osmolator 3152 - Auto Top Off System Water level controller with only one sensor for nano aquariums or small  aquariums with up to 200 liters (55 USgal.), placeable into cabinet  filter systems or on...

This is a direct replacement metering pump for the Tunze Osmolator 3155 or 3152 or can be used with other top off systems. Details on Tunze Metering Pump: Metering pump capacity: 2.95ft: 13.74gph, 4.92ft: 12.42gph, 6.56ft:...