Hagen Marina Ultra 2-Way Aquarium Air Control Valve

Marina 2-Way Airline Control Valve – A handy valve that splits and regulates airflow from a single air pump into two lines. This plastic accessory lets you run two airstones or other air-driven devices at once and control how much air each one gets. You simply connect your pump’s tubing to the inlet and then attach two tubes on the outlets going to your devices. Each outlet has an adjustment knob – turn the knob to increase or decrease the air flow as needed. It’s perfect for customizing aeration in different parts of the aquarium or balancing the flow between two decorations.