PEX B Pros and Cons

PEX B uses an insert-style fitting. After inserting the fitting into the pipe, you fasten it in place with a copper sleeve, using the crimp tool.

Pro: Because PEX B doesn’t require an expansion tool, the joining method is faster and simpler than the process for PEX A. In cold or hot weather, the joining method workflow remains the same.

Con: Because PEX B fittings are smaller in diameter, this joining method downsizes the diameter of the pipe at the joint. The result is an increased resistance to flow and a decreased volume of water to the fixtures in your home. Additionally, the joining method isn’t as ergonomic as PEX A: if the crimp tool isn’t square on the sleeve, you can crimp it crooked and cause a leak.