Aquarium Air Tubing Accessories Non-Return Valves,Check Valve for 3/16 '' Fish Tank Air Line (Black 12 pcs)

I saw some reviews and they said that they whistled. They were probably whistling because you did not have the tubes attached to both ends. I discovered that when I first plugged them in. But as soon as I attached the other side of the tube the whistling stopped.

A must have on any airline tubing if the air pump is below the water line in case of mechanical failure or power outage. A simple insertion of a paper clip thru the inlet if the passage is not completely open as stated in the description. I'm satisfied with this item.

He said they worked well

I was sooo sick of messing with pump-spray bottles that stopped spraying as the volume decreased. These are cheap and easy to use. I am thinking of giving them as gifts-I would be thrilled to have such a pesky annoyance removed from the plethora of annoyances from which I suffer.

Bought these, so that way I can keep moisture out of my lines and they work so far they’re doing their job for what I need them for so overall, I’m pleased

Product works as intended, air in one side and out the other

Four of the 12 did not pass air, used my air compressor at low pressure to open them and they appear to be fine.

Nice

Works nicely

Ordered 12 and only 6 of them work air does not pass through them.

These check valves work well

reçu très rapidement conforme a la description

Five of the twelve do not function; need for improvement in quality control.