🐟 Pawfly Aquarium Check Valves: Non-Return Air Pump Accessories for Fish Tank - Black | Enhance Your Aquarium's Efficiency! Review

For example, they are threaded so you can fiddle with the rubber joint if it starts making noise. I actually like that they are larger than the ones you find in LFS and seem to offer better airflow! Excellent for the price!

This is really awful. They're so cheaply made. Of the 6 in the pack I gave up after trying 3 because they kept losing water (yes they were right). Today they are returning to Revain and I will never buy anything from them again.

So, uh. They work fine. Sir enters one way and exits the other, but not vice versa. They should. But they whistle. Anyone else hear that? It's damn loud. I hope I get used to it quickly or look for replacements for quieter ones. I installed one between my air pump and the foam filter and the others between my air pump and the air stone.

I use them to aerate water bottles that I drink through a hose (like the CamelBak system but from a bottle instead of a bladder). I drill a hole in the cap for the hose and another for one of those check valves. This prevents the bottle from spilling but allows air to pass through so the bottle doesn't collapse when I drink. These valves are very simple and easy to clean. The two-piece body is threaded and the valve itself is held between the halves. I use a short length of plastic tubing on…