ALEGI Aquarium Control Valves for Aquarium Air Pump Single Way Plastic Air Flow Control Regulator for 3/16" ID Tubing 12 Pack (Black)

They're easy to use, cheap, and work perfectly for me. Perfect for drip acclimation or controlling airflow.

Nothing fancy. Doesn't need to be fancy. Just needs to control the air which it does just fine.

These are about as inexpensive as they come. They are nearly ON or OFF with very little gradient between.

Excellent at doing valvey things to low volume low pressure air.

Machinist says excellent!

They are extremely difficult to turn. You'll turn it and they'll just screw backwards on you. If you watch my video you'll see what I mean on the 3rd or 4th try. You'll also notice that even though I loosened it, the air stone doesn't activate. Half of them are somehow clogged from the factory and don't allow air through. These are cheap and they act like it. Spend more money and get some that actually work.

This product is terrible. The control valve is crap and does not completely stop air flow.

A durable and long lasting plastic adjustment valve. With no noise as it reduces air volume, this hard plastic is easy to install and use. It’s soft and easy to turn valve along with how many you get makes this buy a great value.