If you're trying to get a PEX pipe plugged into an uncooperative fitting, a PEX expander tool from a hardware ... requiring nothing more than a crimp ring. However, as can frequently be the ...

Proper installation requires a special tool called a PEX crimping tool. When you tighten down a crimp ring properly over PEX pipe and the fitting it’s joined to, it creates a water and airtight ...