CO2 flow regulator for aquarium with bubble counter Needle regulator for CO2 bubble adjustment with bubble counter Products with the best metals (stainless steel and aluminum, long-lasting and difficult-to-damage regulator body, in bright chrome plating, in combination with acrylic and aluminum bubble counter with non-return valve return make these products very elegant, they are very easy to install and use. This combination of a flow regulator with needle valve and bubble counter is necessary to prevent CO2 waste and allows a correct precise dosage of CO2. We recommend the use for aquariums Item name: CO2 flow regulator for aquarium [RegCont-Flux-Inox21] Material: Metal (stainless steel and aluminum) Type: Single Head+Precision Bubble Counter Included in the sale: 1 x needle valve flow regulator 1 x Precision Bubble Counter 1 x Safety Oring 1 x 4/6mm pipe safety nut