John Guest ASVPP5LF Angle Stop Adapter Valve, 1/2" x 3/8" x 1/4" OD

It took me a while to remove my old makeshift valve as it was made of many pieces together and rusty. But putting this one on is easy and make the connections more direct. The connections fit very well. My only complaint is I have to pay double $24 for this valve (vs $11 for 3/8 in) just because I have a 1/2 in shutoff valve to connect to. That does not seem fair. But it is much better than if I have to construct a makeshift valve from Home Depot as they do not carry such a valve.

Misplaced the one that came with my aquaverse water filter. This fits the countertop Aquaverse water dispenser that I got from Costco. Hope this helps anyone looking for this particular one!

Easy install, no leaks!

Works great with my RO system. No problems so far. Adapter fits either side of valve.

Quality part. Used to replace the plastic RO feed water adapter that comes with the Whirlpool RO system after going through several due to striping the threads.

Reviews are right: quality is good, design is good, easy to installI have both 1/2" and 3/8", and wasn't sure which one was which. Adapter made life easier.

The 3/8" to 1/4" converter is really handy. A very well designed product especially for the under the sink filters that are connected to a separate filter faucet.

John guess makes top quality products and that's all I would buy for my plumbing needs

We just bought a fridge with a water line, I hooked this up under the sink and used the adapter provided, pushed the line in and done. No fuss, no muss. Easy to install. Amazing product and made the installation a breeze. Highly highly highly recommended!