Adjustment Rings in Manhole Rehabilitation: What Sewer and Water Contractors Need to Know

Manhole rehabilitation is a critical part of sewer infrastructure maintenance, especially in older cities like Chicago where utility networks date back decades. Among the most overlooked—but essential—components in this process are adjustment rings. These stackable spacers play a key role in adjusting manhole elevations, sealing off inflow and infiltration, and ensuring long-term structural integrity.

Whether you’re working on a sewer main replacement, road resurfacing, or manhole realignment, selecting the right adjustment rings can make the difference between a temporary fix and a permanent solution.

What Are Adjustment Rings?

Adjustment rings are placed between the top of a manhole cone and the frame to:

• Raise or lower manhole elevation to match road grade

• Provide a stable base for the cast iron frame and lid

• Seal off leaks and reduce water infiltration

• Reduce load transfer from traffic directly to the manhole cone

They are available in a range of materials, including concrete, composite, rubber, and polyethylene—each with unique performance characteristics.

Why Adjustment Rings Matter in Rehabilitation

In manhole rehabilitation, the structure’s top is often deteriorated or misaligned due to shifting soil, vehicle impact, or aging materials. Adjustment rings provide:

• Elevation correction: Ensuring the lid is flush with the street surface

• Water infiltration control: Reducing stormwater entry into the sanitary system

• Traffic load management: Minimizing stress on aging manhole cones

Poorly fitted or low-quality rings can lead to long-term structural damage, safety hazards, and even permit violations.

Choosing the Right Type of Adjustment Ring

The choice of adjustment ring depends on application, budget, and project requirements:

Material	Benefits	Common Uses
Concrete / HDPE	Strong, affordable, widely accepted	Heavy-duty and municipal projects
Rubber	Lightweight, watertight, flexible	Inflow prevention and sealing
Composite	Corrosion-resistant, stackable, durable	Long-term rehab projects

Some municipalities have specific specs for ring types or require ASTM or AASHTO compliance. Always check bid documents or municipal standards before ordering.

Installation Best Practices

• Inspect the cone for structural damage before ring placement

• Use non-shrink grout or sealant between rings to prevent shifting

• Ensure the final elevation matches roadway grade and complies with slope requirements

• Avoid stacking too many thin rings—use proper height combinations

• Test for seal integrity if using watertight materials

Improper installation can cause settlement, lid rocking, or frame displacement, leading to future failures or safety complaints.

Partner with A&A Equipment and Supply for Adjustment Rings and Expertise

At A&A Equipment and Supply, we supply a full range of adjustment rings in concrete, rubber, and composite materials, helping contractors across Illinois meet municipal specs and timelines. We also provide the power equipment and repair services that keep sewer projects on schedule. Whether you're managing a small repair or a citywide rehab project, we’re your partner for sewer and water materials, fast service, and expert support.

Visit https://www.aa.equipment/ or contact us today to learn more about our adjustment rings and utility construction supplies.