1)Bladder Accumulator. 2)Made of Rubber. 3)Used for Coal and Electric Power. bladder accumulator main specifications:Materials: NBR, butyronitrile rubber, IIR, butyl rubber and EPDMCapacity: 0.25 to 100LLength: 260 to 2,185mmDiameter: 56 to 299mmUsed for coal, electric power, oil and chemical saving.