 | Catchbasins and Maintenance Holes, Precast Concrete  (Rainbow Concrete Industries Ltd.) |
| Maintenance Hole 2400 mm Diameter (Munro Concrete Products Ltd.) |
| Maintenance Hole 2400 mm Diameter, Precast Concrete (Hanson Pipe & Precast Ltd.) |
| Maintenance Hole 2400 mm Diameter, Precast Concrete (Con Cast Pipe Ltd.) |
| Maintenance Hole and Valve Chamber Units, Concrete, Precast (M-Con Products Inc.) |
| Precast Concrete Maintenance Holes (M-Con Pipe & Products Inc.) |
| Precast Concrete Manholes (Co-Pipe Products, Inc.) |
| Precast Concrete Storm Sewer Catchbasins and Maintenance Holes (Hy-Grade Precast Concrete) |
| Precast Concrete Storm Sewer Catchbasins and Maintenance Holes (Miller Precast Ltd.) |
| Storm Sewer Units, Concrete, Precast (Central Precast Inc.) |
| Storm Sewer Units, Concrete, Precast (International Erosion Control Systems) |
| Storm/Sanitary Sewer Units, Concrete, Precast (Anchor Concrete Products Ltd.) |
