Can someone please let me know if you have to use Wirsbo fittings with Uponor pex a tubing? Thanks Joe

If you ask the manufacturer, they will say you need to use wirsbo fittings. However, crimp rings with standard pex fittings will work just fine on any pex out there. Just like push fit fittings will work will all pex pipe. Only problem with mixing fittings/connectors with different types of pex brands is that it could leave you open to liability if the system ever fails/leaks.