... in concrete pump parts and spare parts,like delivery pipe,elbow,coupling,fitting schwing end hoseThis is ... the brief introduction of our products: we produce and supply concrete pump parts( ... :90, 60,45,30,15 3. concrete pump coupling/clampmaterial:Hi-Mn13,20#steel,etcsize:from ... rubber sponge balls:for all kinds of concrete pump pipefittings 7.wear plate and cutting ring Fitting ...