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This coupler can be used to join two pieces of CO2 tubing. Compatible with CO2 tubing sold by Nature Aquascapes.
Intense Mini CO2 Regulator
Atomic Inline CO2 Diffuser - 16/22mm
Precision CO2 Atomic Diffuser - 80mm
Precision Atomic+ CO2 Diffuser - 70mm (With Built-in Check Valve)
Advanced Precision CO2 Bubble Counter-Inline With Magnifying Holder