DIY CO2 Diffuser D501 Generator Kit Planted Aquarium Aquatic Landscaping CO2 Diffuser Description: 100% , high quality Unique acid particles blocking filter to prevent clogging and corrosion tuning valve and prolong life. Tuning valve Removable cleaning. Transparent circulation piping, fluid flow can be observed at any time. Adjustable pressure relief safety valve acid value (manual + auto). Turning Clockwise is to increase the safety pressure level ---> The valve will let the CO2 gas release out of the bottle at higher pressure level automatically Turning Anti-clockwise is to decrease the safety pressure level ----> The valve will let the co2 gas release out of the bottle at lower pressure level automatically Features: -Model: Pro D501 -Pre-connection, avoid wrong connection -Pure and long lasting Co2, promoting plants growing -Easy to set up, low cost, convenience, practical and safe -Corrosion-resistant, multi-tool holder shelf -Universal design, fits most tanks or aquariums What do you need to prepare for this systems? below (not included): 200g x Citric acid powder or Vinegar 200g x Baking Soda powder 2 x Soft drink bottles (2 Liter) Specifications: Item Type: DIY CO2 Diffuser Material: Size: approx.17.0 x 5.0 x13.0 cm / 6.69x1.97x5.12in Color: Green / Blue (Optional) Quantity: 1 Pc Note: Transition: 1cm = 10mm = 0.39inch. Please allow 0-1cm error due to manual measurement. Pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 x Pro Needle Valve 1 x Safety valve (with pressure gauge) 1 x DIY CO2 generator main body (colour by your choice) 1 x Complete connecting CO2 tubing 1 x English manual (other accessories demo in the picture is not included.)