There are three models with a pump outlet from 100, 200 (2 x 100) and 400 (2 x 200) l/h, on which the smallest model has one and the two larger ones both have two individually adjustable air outlets. And they come equipped with one or two EHEIM diffusors. The air flow can be regulated at each outlet on the pump and also on each diffuser. This allows you to set your own individual bubble effect. Advantages of the EHEIM air pump: 3 models to choose from Very quiet operation Long service life, best quality Airflow adjustable at each air outlet on the device Additional adjustment of the air flow and bubble effect using the diffuser Completely equipped with - 2 Diffusers - 2m airline tubing - Rubber suction pads to dampen vibration - Tab with hold for hanging vertically