Available in stainless steel or brass body construction. Each radiant heat manifold package (set) has (1) supply manifold with flow meters, (1) return manifold with balancing valves, plus automatic air vent, filldrain valves on each manifold, shut-off ball valves, supply and return temperature gauges, pex adapters and mounting brackets. All units are pre-assembled and pressure tested. Manifold's outlets are at 2" oc (on center). Maximum flow per branch is 1.4 gpm (gallons per minute). Max. Operating temperature is 158f.