I have an Infloor radiant heating floor in my home.  The peripheral manifolds are made of a gray plastic.  Last winter, one of the manifolds extruded a valve and leaked -- this manifold had 3 loops with 3 valves.  The supply and return lines appear to be 3/4 inch copper pipes, and the loop lines are 1/2 inch red infloor tubing.  Does anyone here know where one of these plastic manifolds can be purchased?  If not, does anyone have a suggestion concerning the type of manifold to install and where to purchase it?  To install a new manifold, will I need any special equipment?

Thank you in advance.  John Young