Available in a variety of sizes, our round/manhole PRO-RING risers are INDOT-approved, durable, and lightweight. They're made of expanded polypropylene, which is high strength and 1/20th the weight of typical concrete grade rings. This makes them easier to install, less prone to damage during transportation, and able to absorb shock/energy better than rubber shims.
PRO-RINGs meet AASHTO HS-25 load requirments. They are not damaged/compromised if in direct contact with 285 degree hot mix asphalt. They allow for adjustments to within 1/4" of desired elevation; there are also no stacking height limitations.
Standard dimensions are 24" I.D. x 34" O.D. It's advised to use M-1 Adhesive to seal the PRO-RING for best results.
We are TYPICALLY able to provide same-day pickup for the sizes highlighted above. Call ahead to confirm availability.
PRO-RING Manhole Riser
Our manhole PRO-RING risers are available in three different adjustment sizes: finish (for finite adjustments), angle (for sloped adjustments), and grade (for gross adjustments).
Finish adjustment sizes are available in 34" O.D. x 24" I.D., 37" O.D. x 27" I.D., 40" O.D. x 27" I.D., 35" O.D. x 25" I.D., 36" O.D. x 24" I.D., and 46" O.D. x 36" I.D. These are available with ring heights of 3/4", 1", 1-1/4", 1-1/2", 1-3/4", 2", 2-1/4", 2-1/2", 4", and 6".
Angle adjustment sizes are abailable in 34" O.D. x 24" I.D., 37" O.D. x 27" I.D., 40" O.D. x 27" I.D., 35" O.D. x 25" I.D., 36" O.D. x 24" I.D., 46" O.D. x 36" I.D, and 40" O.D. x 31" I.D. These are angled 3/4" to 1-3/4".
Grade adjustment sizes are available in 34" O.D. x 24" I.D., 37" O.D. x 27" I.D., 40" O.D. x 27" I.D., 35" O.D. x 25" I.D., 36" O.D. x 24" I.D., 46" O.D. x 36" I.D, and 40" O.D. x 31" I.D. Ring heights for these sizes are 2", 4", and 6".