[Class : 19] Pipes (Not Of Metal), Prestressed Concrete Pipes, Prestressed Concrete Cylinder Pipes, Bar Wrapped Cylinder Pipes, Rcc Pipes And Its Allied Products Like Water Tanks, Septic Tank, Sentry Cabins, Penstock Pipes (Metal) Prestressed Concrete Sleepers, Joints And Fastners For Pipes (Not Of Metal), Building Materials (Non Metallic), Manhole.Covers (Not Of Metal) Drinking Water Supply Projects, Irrigation Projects, Hydro Electric Projects, Sanitation And Sewerage System, Construction Of Intake Wells, Jack Wells, Pump House, Electro Mechanical Works, Gravity / Pumping Mains, Water Treatment Plants, Ground Level Reservoirs, Overhead Tanks, Distribution Lines, Sewage Collection Well, Sewage Pumping / Gravity Mains, Sewage Treatment Plants