Manhole – Riser

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 Riser Components –Riser sections are used to increase the height of a manhole structure 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