Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Makes Plumbing Simple

I love these fittings. They connect copper, PEX and CPVC without any difficulty. They are rated to be buried in walls, and can handle both potable water and heating system applications. Make sure the pipe is cut square, clean, and push the fitting on. That's it. There is a sleeve and teeth inside to hold the pipe and an internal O-ring seal. I've used these where there was stress at the joint, and haven't had a problem, they hold great. The price is steep when you compare it to a copper solder or PEX crimp fitting, but they're worth a lot in time savings. No more sweating fittings between joists and worrying about setting the house on fire. I also like that they work right the first time, and I don't have to worry about bad solder joints. It makes a reliable mechanically sealed joint in tight spaces in less than 30 seconds. There is also a competing product under the Gatorbite brand that is essentially identical.