quick coupling Specialized in concrete pump parts and spare parts,like delivery pipe,elbow,coupling,fitting schwing,PM, quick couplingThis is the ... supply concrete pump parts(fitting to Schwing and PM , Sany, Zoomlion,CIFA,etc),which include delivery pipe, elbow, reducer, (coupling)clamp , ... ,etc)degree:90, 60,45,30,15 3. concrete pump coupling/clampmaterial:Hi-Mn13,20#steel,etcsize:from 2 to 6inch ...