Quick question: A plumber installed some Rehau pex in my house. I am going to finish the job with Wirsbo (Uponor). The Rehau is also an expansion system right? Can I use Wirsbo tees and the expansion tool to tie into the Rehau (e.g. cut the joints off the current Rehau and use Wirsbo expansion tool and joints? I am fairly certain I can...just want reassurance.