Pex is Pex right? Maybe not.

A recent study of Roth Industries X-Pert S5 by Jana Laboratories Inc. concluded that “By protecting the EVOH barrier layer, the five layer technology is seen to provide significant advantages for handling, installation and operation of hydronic systems and the EVOH layer itself has been demonstrated through testing to provide the barrier protection required to protect the rest of the hydronic system from oxygen damage.” 

Read the full report here