250225-100 - Extension Kit for PRO-BALANCE ManifoldsRehau 250225 100 Extension Kit for PRO BALANCE Manifolds The Rehau 250225 100 PRO BALANCE Extension Kit is designed to expand an existing 1" PRO BALANCE manifold by adding an additional circuit to a hydronic radiant heating system. Built from durable solid brass, this kit integrates seamlessly with existing manifold assemblies, allowing installers to scale systems without replacing the entire manifold. The extension includes both supply and return