Malleable iron pipe fittings are suitable for pipeline connection pieces used in the transportation of media with a nominal size ranging from DN6 to DN150, a service temperature of -29°C to 175°C, and a maximum working pressure of 2.1 MPA. They are an important part of the pipeline systems in the fields of gas, fire protection, water affairs, and heating, ventilation and air conditioning, and can meet the connection requirements of various pipeline systems. Whether it is a straight pipeline or a curved pipeline, or whether it is a pipeline with the same diameter or different diameters, malleable iron pipe fittings can provide a firm and reliable American standard threaded connection, which is convenient for on-site construction.