Reducer pipe Size: 6"-5", 5"-4", 4"-3", 3"-2", ... "-2" Inner Wall Hardened HD, Normal Flanges Available Boom/Line Reducer Concrete Pump Pipe Reducer1.Flanges: integrated2.Quality:hight wear-resisting3.Sizes ... '',5"- 4'',4''-3''etc4.For PM schwing sany ect concrete pump5.Material: ST52, 45Mn 2, 20# steel, etc REDUCERS Specification ...