Co2 Aquarium Regulator Carbon Dioxide Reducing Valves Durable Safe for Fish Tank elgs Description : Features: Be made of stainless steel. It is strong, durable and efficient. Well-sealed caps, leak-proof, non-deformed, never loose. Professional pressure gauge for pressure watching. High pressure gauge shows cylinder pressure, low pressure gauge shows output pressure. Pressure reducing valve: High voltage input constant voltage output 3KG pressure. Bubble counter with check valve: Flow-rate of CO2 gas indication device and prevent water flow back into the bottle. Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Specification: Material:Stainless steel, aluminum alloy, acrylic Size:As the picture shows Interface: W21.8 Package Includes : 1x Aquarium CO2 regulator 1x Wrench