Iberdrola Manholes Iberdrola Manholes of Precast Concrete. Here you can see them and if you are interested or have any questions, contact us. We advise You Technical Specifications os Iberdrola AG Manholes Bottom base (int) Top base (int) Height CM Thickness CM holes (width x height) Weight (KG) 100*100 60*60 100 9 65*50 730