Manhole Riser Rings

J. Thomas, LTD. produces quality Manhole Riser Rings while supplying customers nationwide for over 20 years.
Current state certifications: PENNDOT, NY DOT and MD DOT approved.

J. Thomas, LTD. Manhole Riser Ring

The advantages of using JTL hot-rolled steel extension rings and frames:
Save Time and Money
You no longer have to raise manhole or catch basin frames.
In a matter of minutes, one man can drop in our extension ring or frame, adjust it and replace the cover.
It’s as simple as that!


Download the brochure and measuring form:
J. Thomas LTD. Street Hardware Brochure 2017
J. Thomas, LTD. Manhole Riser Ring Measurement Form

  • Lightweight and Easy To Install
  • Unparalleled quality 3/4″ Stainless Steel turnbuckle
  • Adjustable for tight fit and close tolerance
  • Heavy duty hot-rolled steel for long life
  • Better wear characteristics
  • Various designs to meet all street situations

Fabricated Steel Specifications

  • Our standard is ASTM 36 H.R. steel. Other grades are available.
  • There are no inclusions or slag.
  • All welding to AWS D 1.1 specifications.

Raising Manholes and Catch Basins
Compare: Using the JTL hot-rolled steel extension ring to the alternative method. Why spend extra money and time using the “build-up” or “brick-up” method on your paving projects?
This method requires:

  • A work crew and air compressor
  • Possibly a backhoe and truck
  • Numerous hand tools, bricks and mortar, or concrete
  • Plus the need to often reroute traffic for days

J. Thomas, LTD. Manhole Riser Ring Installation

It takes only minutes for one man with a wrench to install a J. Thomas, Ltd. extension ring.

A single turnbuckle with a ¾” stainless steel bolt is the only adjustment.

No need to remove the existing manhole frame from its embedded position.


J. Thomas, LTD. - Measure Frame OD


Quick measurements for custom rings
J. Thomas, LTD. Manhole Riser Ring Measurement Form


Watch The Video: How To Measure A Manhole Riser Ring


J. Thomas, LTD. Manhole Riser Ring Replacement
Our rings are dropped into place the same day the paver is in operation – reducing the need to reroute traffic.

Watch The Video: Manhole Riser Ring Installation


Manhole Riser Ring Comparison

Quality and Durability are the hallmarks of J. Thomas, LTD’s products.

J. Thomas, LTD. Manhole Riser Ring & Turnbuckle

J. Thomas, LTD. Manhole Riser Ring          J. Thomas, LTD. Manhole Riser Ring Turnbuckle

  • Hot-Rolled Steel
  • Sturdy 3/4” Stainless Steel Turnbuckle For Easy Adjustments
  • Rust / Weather Resistant Coating
  • Stacks / Stores Neatly Without Warping
  • Standard, Non-Standard, and Adjustable Rings Available

Other Riser Rings & Turnbuckles

AHP Manhole Riser Ring         AHP Manhole Riser Ring 4

EJ Ring          EJ Ring 1

DOWNLOAD:      J. Thomas LTD. Street Hardware Brochure 2017

DOWNLOAD:      J. Thomas, LTD. Manhole Riser Ring Measurement Form

Contact J. Thomas, LTD. to discuss your application:

Phone: (717) 397-3483

Manhole cover Ring
Manhole ring
Manhole Extension Rings
Manhole Adjustment Rings
Manhole Adjusting Rings
Riser rings
Adjusting Rings
Extension Rings
Steel riser rings
Sewer rings
Sewer riser rings
Sewer Extension Rings
Sewer Adjustment Rings
Catch Basin Risers
Catch Basin Riser Frames