BrassCraft (4-Pack) G2CR19L1X 1/2-in Nominal Comp x 3/8-in OD Outlet Chrome Plated Brass 1/4-Turn Angle Stop Valve Less Outlet Sleeve/Nut (4-Pack)

First, this product comes with the copper squeeze ring and the surrounding nut for both the 1/2 connection with the incoming water, and the 3/8th connection towards the faucet. It's essentially the same as the single Brasscraft 1/4 turn valve you'd get from Amazon or Home Depot / Lowes. Second, you don't have to remove the previous compression nut, and can re-use them. Out of all the things that could fail in the connection, the previous nut is definitely not it. What does fail, and the reason you're replacing, is the crappy old style valves that require multiple turns. Mine started dripping at the connection, are impossible to turn, and one even completely fell apart during a shutoff, forcing me to turn off the water main at home. The build quality of this thing is fine. The longest installed one is one year in my home. I've bought several of these and installed over time to replace valves that are gradually starting to fail. For installation: there is no need to use specialty tool to remove the existing compression nut. However, you must tighten the compression nut as hand tight as possible to ensure there is no leak. Hand tighten is all you need. Once your wrench stops moving from typical human pressure, it's probably fine. One gotcha is that you might need 2 large adjustable wrenches to do the job because you need one to hold the valve in place. And these wrenches need to be large because the 1/2 in nut and the valve itself might be too big for most regular sized wrenches. That's it -- good product, good price. If you're gonna buy 3, might as well spend a little bit more to buy this 4 pack.

4 pack was perfect for the bathroom upgrade with 2 faucets. Easy to use and quality is as good or same as the ones you grab from Home Depot.

Fantastic Buy. I use these all the Time and when I saw the multi-pack I knew I had to have them. They work great and I’ll continue to buy The multi-pack for Their value

These shutoff valves are pretty standard. I used one to replace a shutoff valve frozen by corrosion. I used the compression bead and nut from the discarded valve. Since a compression bead is deformed when originally installed, I had to use pipe sealing compound smeared on the old compression bead, and I applied the sealing compound on top of the 3 wraps of sealing tape around the threads. So far, no leaks. With that said, the US needs a new standard for shutoff valves at sinks, toilets, and other water appliances. The current standard shutoff valve will corrode over time and become inoperative in moderately hard water. Several of the shutoff valves in my 40 year old home are frozen. I'll have to replace them one at a time when the sink, toilet, etc needs maintenance.

very good quality works well