Internal filter 50-80L with adjustable flow rate Filter slides out of mounting plate for easy cleaning Adjustable outflow direction Filtration in various stages Separate diffusor for oxygen supply Description: Powerful and convenient internal filter suitable for aquariums to 160l. Installation: Adjust the outflow direction by means of the rotatable exhaust pipe.Use the inclosed air hose for extra oxygen. First remove the rubber cap on top of the filter.The flow rate can be adjusted with the flow regulator on the side