DaToo Aquarium Air Pump Check Valve 12PCS Fish Tank One Way Non-Return Check Valve Air Pump Accessories for 3/16 Inch Airline Tubing

Works perfectly. Some have said they are plugged, but you just need to loosen the reed. Funny enough if you try to blow into it, they stay closed, but if you suck gently on the downstream side, they open right up and work/seal perfectly from that point.

These are very good quality valve. Slide a toothpick into the end of the valve and gently open it, then slide it onto the tubing. Dampen the end if it doesn't slide on easily. They are easy to connect using some warm water on the tubing. These are a great valve. They work well at preventing water backflow.

Good Great value

Used one of these for my CO2 and for my air pump they function as intended.

I have three aquariums, and aeration is vital to the health of my fish. While ensuring sufficient oxygenation is important, equally important is preventing water from backing up to the air pump. These check valves protect my air pump and ensure efficient airflow. I am very pleased with this product.

These aquarium air pump check valves arrived in a simple multipack and were easy to inspect right out of the bag. One valve had visible internal damage on arrival, but the remaining valves were intact and usable. Given the quantity included, this did not affect my ability to use the set as intended. The valves install easily into standard airline tubing and allow airflow in the correct direction while preventing backflow. Once installed, they functioned properly and maintained consistent air movement to the tank equipment. The clear housing makes it easy to see orientation and airflow, which is helpful during setup. The materials feel appropriate for aquarium use, and the valves seat securely in the tubing without leaks. Overall, this is a practical multipack that does what it’s designed to do. Despite one damaged piece, the remaining valves work well and provide good value for typical aquarium setups that require multiple check valves.

They work well but don't step on em 😂

These are better than the blue ones that I use to use/have. Seems to put out more air than the blue ones that are like foam. This ones don't seem to restrict air flow. Very satisfied and you get a lot in a package.