Co2 Reactor Air Diffuser Generator Double Connector Tube Valves Guage Bottle Cap Diy Aquarium Supplies

feature: If the aquatic plants in your fish tank/aquarium are slow growing and need more CO2, this bottle cap may help you Description: Name: Co2 Reactor Category: Aquarium Equipment The specifications of the trachea connected by the joint are: inner diameter 4MM outer diameter 6MM Material: All are high quality ABS engineering plastics The details of the materials are real, the design is exquisite, and the production is precise Packing list: 1 x Co2 Reactor Note: Different displays may cause the color of the item in the picture a little different from the real thing. Manual measuring,please allow 1~3mm error,thank you. Features: ['--This CO2 cap is suitable for most types of DIY reactors', "--Easy to use. Just screw the cap onto the beverage bottle. Easy to seal, won't let air out easily", '--The plastic material makes this cap not easy to rust, safe for your fish and water plants', '--For those who like DIY CO2 setup, this bottle cap is a good helper for them in their CO2 generation process', '--With 2 holes, you can add tubes and other tools like bubble counters or other things to help you understand and control the process']