This model is designed to be used only with regulators that have the option of attaching a bubble counter to it (such as the Easy Aqua Single Guage Regulator). Please be sure you are buying the correct model.

This unique professional grade bubble counter is used with a CO2 system to count your CO2 bubbles.

Not only being a bubble counter it has a patented check valve with screw lock mechanism built into it. Once you have inserted your CO2 tubing into this bubble counter and locked it in， there's no chance of the tubing popping out giving you total piece of mind.