Como 4 x Aquarium Tank Air Pump Plastic Non Return Check Valves Red Clear

Anyone whose had a DIY CO2 system backflush all over their floor will understand the importance of installing a checkvalve into a DIY CO2 plastic airline.

There are many companies that manufacture these devices, so its best to see if you can find some user reviews online before you purchase one.

So far, these checkvalves are doing their job.

I will update this review in the future based on my longterm experiences with these devices.