Prevents water from the aquarium from flowing back into the CO2 technical equipment (check valve)
Very simple assembly: cut the CO2 hose and insert the check valve between the two ends (the arrow is pointing towards the aquarium).
Safety: locking nuts preventing the detachment of the CO2 hose
For CO2 hoses with a diameter of Ø 4/6 mm
Contents: 1 water check valve for CO2 systems, with locking nuts for the hose