Concrete pump pipe Clamp coupling is a concrete pump spare part,it is used to connect and fasten concrete pump pipelines and rubber hoses.it is always used together with the rubber gasket. Rubber gasket also called rubber seals,or rubber O rings.concrete pump pipe clamp are top quality in china which can be used on SCHWING , PM, KYOKUTO, SANY, ZOOMLION, CIFA etc and have got high praise.  Size: DN50-DN200 * Material: 40Cr * Technology: casting and forged * Working pressure: 130bar * Surface treatment: galvanized or baking paint * Flange:148mm , 157mm, 166mm, 195mm and so on * Advantage: durable,light and low price