Water treatment for aquarium -co2 diffuser aquarium glass CO2 reactor Highlights generic brand co2 diffuser aquarium glass CO2 reactor A non-return function to prevent backflow when the pressure changes. Easy to install and use, interchangeable part, anti-reverse design. The nut locking system is able to lock the CO2 pipe and prevent accidents. Easy to read and easy to maintain. Useful for estimating the amount of CO2 released into your aquarium, ideal for any type of aquarium, fish tank, etc. Specification: Material: Aluminum alloy Length: Approx.8.7cm/3.43inch Package includes: 2pcs Aquarium CO2 Regulator Note: Pay attention to the gas flow direction when installing. For aquatic containers, it is recommended to use 2-3 bubbles of CO2 for 1 second. Please allow slight difference due to manual measurement.