The Multiflex H-blocks are designed for the connection of radiators with integrated valve set. The fittings are soft sealing to the radiator. Depending on the version, the connection to the radiator is either with G 3/4 union nut and insert to radiators with G 3/4 external thread (Eurocone) or with G 3/4 union nut and nipple to radiators with G 1/2 internal thread.