Manhole – Base

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 Base Components –Base sections are the foundation of a manhole structure and are available in a variety of base, knockout, or blockout sizes. Manhole bases units are also available with a variety of drainage inverts.

Manhole components include:

• Base Unit
• Riser Sections
• Concentric/Eccentric/Slab Tops
• Grade Rings
• Cast Iron Ring/Cover