Bolt 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. Serving brand include Schwing, Putzmeister, CIFA, Sany,Zoomlion….etc. It works together with rubber gasket(seals) in pipe connection. Specifications:  concrete pump pipe fittings clamp coupling adjustable Material Hi-Mn 13 ,20#steel,40cr . Size  2 inch-8inch(DN50-DN200) Type Snap, bolt, screw, wedge clamp Manufacturing Method Casting or Forged Painting Painting or Galvanizing Application   Concrete Pump pipe fittings for Putzmeister,