Precise adjustment of the amount of CO2: With the CO2 pressure reducer, you can adjust the amount of CO2 precisely and safely in no time at all. Precise adjustment of the number of Bubbles: The built-in fine needle valve gives you full control over the amount of CO2. The high-quality bubble counter allows regulation according to the usual number of bubbles per minute in aquariums. Thus the plants can be optimally supplied with CO2 and grow beautifully. Monitor: Thanks to the two high-performance precision pressure gauges, the CO2 pressure in the bottle and at the outlet can be controlled easily and reliably. The cylinder pressure indicates when the CO2 is exhausted. This allows the next filling to be optimally planned and CO2-free waiting times to be avoided. The pressure at the outlet of the aquarium also makes it possible to check the optimal water flow in the aquarium. High-quality materials and elegant design: The CO2 pressure reducer for the aquarium is made of stainless steel. The minimalist form meets the highest design requirements with understandable operation. The Kit: CO2 pressure reducer, bubble counter, assembly tool, quick start guide. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.