The Contractor shall provide all labor, tools, equipment, and materials to perform all work related to the replacement of drain lines in four bathrooms on the 1st floor, four bathrooms in the 2nd floor, and four bathrooms on the 3rd floor of Building 1787. These tasks include: 1. Replace all drain lines from sink, shower and toilet. Use existing drain line sizes. 2. Install new water saving toilet or match current model; 3. Install new sink similar to existing sink. If hot water line is exposed, ensure the line is insulated. 4. Replace shower head and shower valve or match existing; 5. Keep existing vent system; 6. Install new bathroom tiles, match existing as much as possible. 7. Finishing paint to match existing. Repaint entire wall if necessary, so that there are no color mismatches.