Annual Maintenance Contract Of Existing Sewerage Vehicles Of Gvmc For Desilting Of Manholes, Suction Of Sewage From The Manholes For Smooth And Free Flow Of Existing Underground Drainage Network And Removal Of Silt From Ugd Pump House In Zone-Iv Under Ae(Ws&S)-12 Section In Gvmc, Visakhapatnam For The Year 2025-2026.