Manhole Systems, Inc. - Riser Specialists
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MS-501 TB


adjustable manhole riser ring


  • 3/4" A36 HR steel inner ring
  • 1/8" A569 CR steel intermediate ring
  • 1/2" square A36 HR steel outer ring surrounding the intermediate ring at finished elevation exclusive to the MS-501 TB model
  • The unique turnbuckle design provides a 1" adjustment in diameter to allow for maximum flexibility on the job
  • Four (4) stainless steel field-molded locking mechanisms secure the riser ring to the casting
  • Our custom manufacturing process allows the production of risers for all size manhole covers
  • See measuring instructions below


How to Measure diagram

Three (3) measurements are needed when ordering:

  1. Outside diameter of the cover
  2. Thickness of the lid
  3. Height of the vertical adjustment --
    1/4" increments with a 3/4" minimum.




Manhole Systems, Inc.
P.O. Box 278
Richmond, OH 43944

Phone: 1-800-433-3995
Fax: 1-740-266-5103

Copyright © 2007
Manhole Systems, Inc.