A one-way professional check valve. Small and compact, about 4cm long.
Can prevent the backflow of the aquarium due to the decrease of CO2 pressure, and maintain the function and service life of the CO2 bottle.
Easy to install, no other tools are needed, it can be connected to any location in a few seconds
Can be used for standard aquarium CO2 tubes (inner diameter 4mm, outer diameter 6mm).
Suitable for carbon dioxide supply systems in fish tanks, aquariums, etc.