PRODUCTS Ductile iron pipe fittings Malleable iron pipe fittings Gray iron pipe fittings Available a wide range of Ductile iron, Malleable iron and grey iron steel. hot dip glavanized pipe fitting produced by Madison are in sizes 1/8?through 4” threads, length will be according to the customers’requirement . Pipe fitting are casted with grooves or shoulders to permit fast installation and can be wildly used in various pipeline to convery water, gas,steam,oil and so on. With the four assembly lines imported from Germany, Denmark, Japan and Korea, the factory has an annual capacity of 35,000 tons of casting & forging products.