1pc Stainless Steel CO2 Check Valve - One-Way Airflow for Aquarium CO2 Diffuser & Regulator - Prevent Backflow for Fish Tank, Hydroponics, and Beer Brewing Systems

Can prevent the aquarium from the water flowing back, which is caused by the decrease of CO2 pressure,and keep the function and service life of CO2 bottle.When used in the Ozone generator, it can prevent the Ozone from flowing back to the air pump and eroding the propeller.

Fits standard aquarium CO2 pipe(4mm) internal diameter.

Material Stainless steel

Size(L*W)40mm x 4mm(approx)

Package includes Stainless Steel check valve x 1

It can protect the power head from the water flowing back which is caused by power cut.