Stainless manifolds are to be used in closed loop hydronic heating, cooling and snow melting system. These preassembled 1-1/4" diameter stainless supply and return manifolds come attached to two 6-5/8" spacing brackets for compact remote mounting. This stainless manifold provides shut off and balancing valves for each circuit. Manifolds used with flow rates up to 2 gpm per circuit, maximum of 18 gpm per manifold. The air bleeder and purge valve are connected and factory tested. 1-1/4" Union connection, 1" NPT removable end caps. SVC Circuit connection fittings are sold separately.