For no-compromise installations, Watts Radiant offers the German-crafted stainless steel radiant heat manifolds by Dumser. The manifolds are constructed of heavy-walled, DIN standard stainless steel tubing from Germany. All seams are robotically welded. All matching accessories are made of solid brass and heavily plated with nickel to match the appearance of the tubing. The manifolds come pre-attached to mounting brackets and vibration-absorbing clamps. Nominal 1" diameter trunks can be joined to serve more circuits. Watts Radiant. Circle 7.