Why a check valve is a must
A check valve is a must for any aquarium equipped with a CO2 kit. Why? If you stop adding CO2 to your aquarium, the water from your aquarium will slowly drain back to your CO2 pressure regulator through the CO2 hose. And that can cause damage to your CO2 system.
This is why you should always install a check valve! It’s actually very simple: it stops the water from damaging your system. And that is what this model does perfectly.