John Guest Speedfit 3/8 x 3/8 x 1/4 Inch Angle Stop Adapter Valve, Push to Connect Plastic Plumbing Fitting, ASVPP1LF

just what we ordered

Some of these come with different sized inlet/outlet and you can use an adapter to downsize I believe, but if you have a Watts RO system with the crappy brass small/thin rounded handle that needs to be turned 3x or more from full close to open, this replaces it just fine with no adapter needed if your need is 3/8 on both sides. Quarter turn and you are done. Works great!

Works perfect and I would recommend to anybody in need. Basically this was the main part I needed after much trial and error with different adaptors on my water filtration system. I didnt use any Teflon tape and no leaks. Very high quality

I bought this product to split the water line under my kitchen sink. The 3/8 line goes to the sink and the 1/4 line goes to a water filter. What all can I say? It works without springing a leak. I only tested the valve a few times when I first installed it. If you are turning it on and off 20+ times a day, it might wear out, but I cant think of any applications which would require you to do so. Use some plumbers tape over the metal threads on the source 3/8 line and the 3/8 output.

No plumbers tape or brass nuts to fit and leak. This simply fits between the water line with push in fittings. Its so easy to fit and no leaking. works well too.

This was a perfect fit for my application- connecting a R/O filter to my kitchen sink. No leaks and an easy installation. Saved money vs. trying to piece something together at the hardware store too. Fast shipping as always. Well worth it!

Needed to make a connection to my BRS-RO/DI system for reef tank. sink at home already has a RO system for everyday use so i need to make the connection from the bathroom sink. This saved the day, after looking at different Home Depots and other stores i shoulda just come here, heck i already do all my shopping here. Easy hookup no explanations needed, saved the day.

This works well and is a breeze to install. It can rotate around its axis, so once it tightened you can position the new 1/4 valve where you want it to be. No leaks and is functioning well.

My previous valve was twice the size and additional fittings (adapters). This just fits into the angle stop valve under the kitchen sink and the faucet host. This valve is also much easier to turn on and off.

My first valve leaked and contacted the seller. They replaced it for free with shipping included and the new valve works perfect and is a 5 min install. I would buy again.