Manholes –Manholes are cylindrical hollow concrete structures typically installed vertically below grade. Manholes are an assembly of various components and are then capped at street level with a round cast iron cover. They are placed at vault openings or pipe junctions and provide maintenance and inspection access to underground piping systems.
Manhole Grade Ring Components –Grade rings are used to increase the height of a manhole structure to reach grade level and are available in a variety of sizes.
Manhole components include:
- Base Unit
- Riser Sections
- Concentric/Eccentric/Slab Tops
- Grade Rings
- Cast Iron Ring/Cover