from viega's website "PureFlow MANABLOC system components are not interchangeable with components and tubing from other suppliers." I was hoping to use uponor pex tubing and fittings for my replumbing job along with a manabloc manifold. Do I need to look for a uponor manifold or is Viega just trying to sell more of there products. I don't realy need a manifold system but the convience of it would be worth the extra cost. Single family home with crawl space. 907sq ft. 1 bath, 1 laundry and obviously a kitchen.