Hi All. I have an Alumapex radiant floor system in part of our house that was installed when we put up an addition 15 years ago. At that time I roughed in addition loops to service a second addition that we are in the process of doing now. Problem is apparently Alumapex is no longer in business. I have a source for Renau radiant tubing. The guy there says that Sharkbite fittings will work between the Alumapex and the Renau. True/false? Would heat shrink tubing be a viable solution if false? Thanks in advance.