See all products of Standard manifolds for central heating system Manifold for heating and cooling systems. 2 outlets. Manifold for heating and cooling systems. 2+1 outlets. Manifold for heating and cooling systems. 3 outlets. Manifold for heating and cooling systems. 3+1 outlets. Manifold for heating and cooling systems. 4 outlets. Insulation for manifolds for central heating system 550 series. Pair of plugs with gaskets for unused outlets. Pair of fittings with gaskets.