Watts 959079 Aqualock (P-600) CTS Quick Connect Coupling, 1/2"...

Plastic. Think the brass variety is stronger? Put one of each on your workbench and smack them with an 18 oz ball peen hammer. Oh, and do wear a face shield. See which one survives. These are no cheaper but are 1/3 the weight. This is what I use in my RV and my house.

I had a leaking pipe in my RV. I dont know anything about plumbing. I hate calling for help because Im always taken advantage and overcharged. This was so easy to install. Two pipes connected and no leaks. No need for glue or anything.

Worked great for me ... I had a leak in my park model & used this to connect Plex to 1/2 inch polybutylene & it was very easy & no leaks ...

I thought I give people looking to buy this wonderful product and not really know how to assemble it some tips I used. To use this product properly. Do the following: 1) Measure the pipes you're connecting, make sure to mark them each 1 and 1/4 of an inch so that you know the depth you need to push it. 2) Insert the little black plastic tube into the mouth your PEX or which ever plastic pipe you're connecting. You do not have to use it for copper. 3) Connect the pipe one at a time. If you're using plastic pipe and have inserted the black plastic tube into the mouth, you may notice a tiny amount of space it will take up. The line you marked in step one may be a little away from the quick connect. That is okay. You can eyeball the depth of the little black plastic tube and know the amount of space it'll need once you're inserting you pipe. 4) You may feel that the pipe and the quick connect may not be harden and you can twist it or loosen it apart. What I do is that do you see that first ring? Use the black round letter U shape piece to separate it from the body then clip the U shape piece down. See attached picture. It will then harden up and you're set to go. Let me know if you need help.