... the brief introduction of our products: we produce and supply concrete pump parts(fitting to Schwing and PM , Sany, Zoomlion,CIFA,etc ... -Mn13,20#steel,st52,etcsize:DN 125mm or DN 150mm (R275,R225,R315,etc)degree:90, 60,45,30,153. concrete pump coupling ... /clampmaterial:Hi-Mn13,20#steel,etcsize:from 2 to 6inch,DN125mm and ...