I’ve tried them all and the Ziss is sturdier and more reliable. It offers superior air control for my betta, who doesn’t like strong current. Other models I’ve tried wouldn’t stay put, letting more and more air in. This one has held steady. Recommend highly.
Yes, the shipping elevates the end cost…WORTH IT!

Customer service is very responsive and shipping was faster than expected!

They're the best...! I use them in line just before it goes into the tank in conjunction with the metal valves that are threaded directly into my pvc Air loops... I will not use any other plastic valves...!!! Thanks for carrying so many quality products...!!! Enjoy nature daily...!

Had to get this because my sponge filter was a bit too bubbly for my floaters, and works great! Very precise on the bubble amounts, just gotta be slow when adjusting.

I'm a rather new fish owner, and just installed the Ziss air valve I picked up at a shop recently. So far so good. I like how it isn't directional like the more standard one I was using, and is easy to adjust. Not sure yet how easy it will be to remove the tubing in the future, but it seems robust enough to take some abuse if the tubes need to be twisted off.

I've been using this this control valve for a while now powering my aquarium Co-op sponge filter and I couldn't be happier. It provides a great control range for air flow, though I usually keep it on max :) I've had no issues with it at all and I can definitely say it's a quality product. Thanks Aquarium Co-op :)

Doesn’t look as fancy as the metal ones, but it is probably one of the best air valves out there that allow you to make fine tune adjustments to the air flow. I own two of them, now.

Always love these air valves, they work incredibly well.

Fits well, works exactly as intended. Wish it was a bit sleeker but does a great job in my long finned betta tank to control flow

I use these in air lines and for fine tuning drip acclimation lines for new stock, better than anything yet solid and easy to fine tune the rate of drip

Affordable & durable with a great level of control, perfect.

High quality air valves. The cheap, pet store valves don’t hold steady. These valves stay where you set them. Excellent.

The best of the best. Love the feel and quality.

I ended up ordering this by accident so I didn't use it yet but it seems to be good quality and will do what it's supposed to.

Great for tanks with no other way to reduce airflow from an air pump

Works Great, Highly Recommend

I use the Ziss Premium Air Valve to get ultra fine control of several air driven devices in my fish room. Perhaps the most demanding is to control the flow into an automated egg trap/fry tray system from Lowell’s Fish Room. This unit uses air to lift water into the tray, which in turn creates suction to the bottom of the egg trap, drawing the eggs up and into the tray. Too little air and there’s no lift and too much air means too little water and also no suction. These valves are great for the fine control I’m looking for.

Perfect.

It’s a air valve so I don’t know much about it. This is the first one I’ve gotten through Ziss., it is definitely a lot beefier than any other air valve I have used. It works extremely well. When I hooked it up, I stuck it under water and it does not leak any air through the knob, which is awesome because all my other ones have done that.Definitely made a good quality and it is beefy!…

Great product they work very well

This is the best adjustable air valve I have yet found.

Excellent!! Fast shipping and packaged nicely!

The best air valve no doubt. It holds solid and doesn’t slip. Love them. Quality is head and shoulders above others.

I use this to lower the air pressure going into my fry tanks and it works great!

I have an air pump that had no air control valve, so one day I jumped on yahoo videos and came across Aquarium Co-op and watched Corey gave a video demo on this item and I was sold. I purchased it and from the initial order to the delivery I had no problems. I attached the valve to my air line, which I use to operate another item I bought from ACO, a sponge filter, which is a fantastic filter that has my water looking crystal clear. I can adjust the air flow by using the valve. This is a great product and I highly recommend buying it for your tank.

These work very well and so glad I have found them.

Does as it’s supposed to do! Great way to easily adjust a bubbler

Quality product, havent used it yet

I wanted to be able to control air flow. After struggling with clothes pins and rubber bands, I decided to upgrade to this air valve. It is perfect.