Pawfly 6 PCS Aquarium Air Pump Check Valves Red Clear Plastic One Way Non-Return Check Valve Fish Tank

Works as intended. Nice bright color makes them easy to locate behind the tank or inside tank cabinet. It whistles when you blow through it so it is very easy to determine the correct airflow direction.

Only needed one. Works the way you would expect. And it's nice having the extra laying around.

Por lo menos para mi es un pesimo producto, prové varias valvulas de las que vienen en el paquete y ninguna logro retener el regreso del agua, ni colocandola por debajo ni arriba de la urna, termine quitandolas

I like these because they do the job and for the most part, are pretty sturdy. With that said, I have accidentally cracked one or two before when trying to get some stubborn tubing off that refused to budge. The flip side of that is that at least it’s really easy to see if they do get cracked 🤷🏻‍♀️. Personally, I like the red color so it’s easy to spot quickly. Recommend and they do what they’re supposed to do so can’t complain.

Excellent one-way check valve.. although not recommended, I've used these on an CO² tubing and they actually work better than some CO² C.V's I paid twice as much for.Would STRONGLY recommend for normal air pump lines on the aquarium.