Malida 1/4" RO Water Tube Fitting Check Valve,Straight Quick Push to Connect Check Valve,for Ro Water Systems,Water Purifier, Pack of 5

The check valve works as intended. I added this valve to the existing system. Installed easily and quickly. I looked on YouTube as to why the water was continuously flowing so I changed this with a new membrane and a flow valve and a drain valve and now using water as it should. YouTube has some great troubleshooting videos to help see why the system doesn’t work as intended. Not sure I need so many valves but now have extras.

No leaks. I'm happy with them.

Not much to say besides it works. I used a few of them and did not have any problems installing them. It does what it says it does.

Good solid product

Well, I only needed one of these, to put in our RO water system - since the stenner tube fails annually, and then the tank overflows. so a check valve in the line to prevent the tank from overflowing made good sense (not sure why the installer didn't do this).... anyway - for the price - how could I go wrong with several of them. Anyway - now I have spares I suppose - but the one I installed is working great, and the slip fitting is awesome. literally took seconds to install this, and a huge problem solved.

First Attempt: Just before midnight, I heard the sound of a waterfall. My entire kitchen was flooded. It wasn't a little leak. It was a massive leak. It's a good thing that I heard it otherwise my entire house would be flooded. I have no idea why the valved leaked. Instructions would be nice. Second Attempt: I took it apart, put it back together and it no longer leaked. The check valve didn't work. It emptied my RO tank into my septic and continued to flow. It took me over a day to figure it out. I'm now concerned that my septic will overflow. I tried a second valve and it also failed to work. I was doing this as preventative maintenance because the RO system is over 10 years old. I replaced the original check valve and my RO system now works like it should. This product is junk!

I installed a ASO (Automatic Shutoff Valve) on my RO unit and noticed that the waste line on my RO continued to run even when the the RO tank was full. After some troubleshooting, I was able to isolate the problem down and discovered that RO membrane canister's built-in Check-Valve was faulty and allowed the filtered tank water to backfill into the filter and out via the waste line. Installing this one-way check valve on line that feeds filtered water from the membrane canister into the tank fixed the problem.

Not sure why folks think they can build enough pressure to blow through these with their mouth, but as soon as I hooked it up the the waste water line on my RO system, it started flowing. Yeah, it takes SOME pressure, obviously more than one can blow with their mouth, but it's not too much if used with pressurized water, hooked up properly.