Pawfly 4-Way Aquarium Air Flow Control Lever Valve Distributor Splitter with 1 Non-return Check Valve and 6 Suction Cups

For some reason I assumed that 4-way valve was going to be made of plastic but it is actually metal. I was impressed by the use of quality materials on this product. The 4-way valve works excellently and is super convenient and handy for controlling my air pump output, I really love it. The suction cups are a bit weak and don't seem to want to stay stuck to the glass long term, but I am using them as extra security for keeping my air lines concealed under gravel. Since the gravel gives a lot of weight to hold it down anyway, I'm not too concerned about the suction cups. If I want good ones, I will just order a pack elsewhere. The the back-flow valve doesn't 100% guarantee protection of water back-flow (it works if it's angled just right but if its not, some water drips past.) I recommend that if you're going to rely on the back-flow valve in this set, test it out first (when its NOT connected to your air pump!) to make sure you have it set up in a way that it will actually work.I really only bought this set of tools because of the 4-way control valve and since that's the item that is perfect, I'm rating it a full 5 stars.

The models of this type of device that are made entirely of plastic fail quickly - control levers break off or the hose attachment points just fatigue and break from nothing more than the weight of the tubing.Enter these beauties from Pawfly - solid metal, tough as nails. And the manufacturer stands behind their products 100% - can't ask for much more. There is no reason to worry that you may get one of those rare items that slipped through QA or that may have been damaged in transit to you - the manufacturer will take care of it promptly.The adjustments are easy to make, you don't need to use all the ports - just close off any not yet in use. This means you can get one with more ports than you need so that you will be sure to have an extra port or two when you do.My only complaint (and this is not really a complaint because I had no intention of using them) are the suction cups. They really smell badly of chemicals and I tested one out just to see how they were - they don't stay stuck to the glass very long. Again, I wasn't buying this for the suction cups, so this is not an issue for me, and frankly, should not be an issue for anyone since what we are buying here is the control valve ;-)Bottom line - I highly recommend this product and will shop from this store again (and already have!).

all the vales work and don't seem to have any issues i had it or only 1 month so don't take my word on it

I have 3 Air Stones and 1 Air difuser Bar, the airflow to each one is verya easy to set.

They work great, and easy to use.