Qualification System Relating To The Establishment Of N. 13 (Thirteen) Distinct Lists Of Qualified Economic Operators For The Supply Of Pipes And Fittings For Drinking Water, Sewer And Methane Gas, Used In The Area Of ​​The Territory Managed By Hera S.P.A. And By The Companies Of The Hera Group - Tender 25_10918 - Rdi 25_371.