Concrete pump spare parts galvanized forged concrete pump pipe coupling pipe clamp * Size: DN50-DN200 * Material: 40Cr * Technology: casting and forged * Working pressure: 130bar * Surface treatment: galvanized or baking paint * Advantage: durable,light and low price Product name concrete pump coupling Colour white, red, black and galvanized and other colour Flange 148mm , 157mm, 166mm, 195mm and so on Brand Sany, Zoomlion, Putzmeister,