... 5,6 inchConcrete Pump Pipe Coupling/Clamp1.material:Hi-Mn13,20#steel,etc2.size:from 2 ... upon to your request Concrete pump couplingsSize2inch-8inchMaterialHi-Mn 13 carbon steel, etcTypeQuick/snap clamp, bolt clamp, ... requeirement.2. elbow/bend and reducer elbowmaterial:Hi-Mn13,20#steel,st52,etcsize:DN 125mm or ... 60,45,30,153. concrete pump coupling/clampmaterial:Hi-Mn13,20#steel,etcsize:from 2 to 6inch ...