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This European Standard applies to detachable connections with outside threaded pipe G ¾ A in accordance with EN ISO 228-1. These are used in the field of heating and cooling emission systems at the following hydraulic connection points: connection between radiators or circuit distributors and the respective pipe. Another connection point, for radiators with integrated valve sets, is the screw connection to the connection fitting or to the screw connection itself. This European Standard specifies the dimensions for the single and the double connection.