Pawfly2-Way Aquarium Air Flow Control Lever Valve Distributor Splitter Accessories Set with 1 Check Valve, T & Straight Connector and 4 Suction Cups for Fish Tank

I have an air pump that is too strong, so I used this to split the feed into 2 stones. Worked great! And you can adjust the flow independently. The suction cups also work nicely to keep the hose (and hence, the stone) in place!

10/9/2023: have been testing for a while, and I LOVE this product! I didn't wanna buy another air pump when I came across these types of valves, and WOW! It works for both my tanks and it's not even loud (excluding air pump). It fits both my tubings and has some pretty strong power! That being said, you do have to adjust it to each sponge filter, one works perfectly fine but when you try to adjust it, the other filter stops. Otherwise, it's a great product! Anyone who has multiple betta tanks or ones with low-flow, I definitely recommend! Will be buying again if I get more tanks!

I love being able to controlling the flow to my different airstone and filters. And the values are great during power outages. Great price too!

I'm very happy with this product, I think it works well. I like the fact that it's metal and easy to control the amount of air that goes in my betta bowls. The suction cups work well if you put them on by working from one side to the other instead of just pushing them on from the middle of the cup. They keep my lines in place, which means I don't have to hold the air stones down by other means. I would buy these again if I ever need more and can recommend them highly.

Update:A month later I took this down a star. Although it is sturdy it is really a pain to get standard sized aquarium tubing on and now off. I basically had to cut the tubing to get it off the valve. Don't expect to recycle short lengths of tubing as you will be chopping them down more just to remove them. On the plus side it will make for a permanent set up.Original review:I really like that this is metal and not plastic. It is heavier than the plastic ones and seems well made. I have actually set it up to split the airline in two for a hydroponic system. The suction cup tubing holders works well; although, I had to use some thinned corn syrup to get them to really fix themselves to my grow box (glycerin works well for this also). My only complaints are that the connector tubes are a bit large and I had to use some dish soap to lube them up so the tubing would slide onto them. If you go that route just make sure that the soap is on the sides and not near the lumen of the valve and that way the soap won't get in your lines. The other complaint is that the bonus check valve was even thicker than the metal so I just couldn't get the tubes on it (even with soap lube) and I ended up using a spare one I had instead.