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PRO-RING™ is the only manhole grade adjustment system made from Expanded Polypropylene (EPP). PRO-RING™ products provide a proven alternative to concrete grade or adjustment rings and is the most advanced concrete ring alternative manhole grade adjustment system available anywhere.

EEP is known for its ability to stand up to the harshest of conditions without damage or deformity for many years. Installed on tens of thousands of manholes and catch basins throughout the U.S. and Canada, these lightweight rings are renowned for their exceptional strength-to-weight ratio, durability, chemical resistance and long service life under the most demanding conditions.

PRO-RING vs. Concrete Grade Rings
  • SAFETY It usually takes two to four men to lift a concrete grade ring, each one risking back injury. A 6″ PRO-RING™ weighs only 14 pounds. Where concrete rings break and can cause injury, the PRO-RING™ system minimizes that hazard, helping reduce comp claims.
  • EFFICIENCY One man can easily install the PRO-RING™ system in just minutes. People are always amazed at our demonstration. The rings nest together and include a finishing ring and a slope adjustment ring for a precision fit.
  • FAST AND COST EFFECTIVE PRO-RING™ products speed manhole installation and repair dramatically, allowing the site to be closed in one day and reducing overall cost from 20% to 30% based on conditions. No water, sand mortar or bricks are needed, just a few simple tools.
    Angle ring allows conformity to sloped road surfaces.
    • Cost effective over the long haul.
    Best Warranty in the industry.

Hundreds of thousands of PRO-RING units have been sold since first being introduced in January 2010.

Check out this big list of PRO-RING advantages.

Check out our brochure or contact us today so we can calculate your savings. 800-345-3764

New PRO-RING sizes

We’ve expanded our product line offering again!

We are excited to announce the addition of two highly sought sizes including angle and finish ring designs:

24” I.D. X 20” I.D. Rectangular
46” O.D. X 36” I.D. Round

The grade adjustment system is manufactured from expanded polypropylene (EPP), which has an exceptional strength-to-weight ratio and meets AASHTO HS-20 and HS-25 loading requirements. With a 50-year projected design life, the system is corrosion resistant and available in both square (34- by 34-inch outer and 24- by 24-inch inner) and rectangular (36- by 46-inch outer and 24- by 36-inch inner) profiles. Both the square and rectangular profiles are available in a variety of heights, including 0.75-, 1-, 1.25-, 1.5-, 2-, 3- and 4-inch. They also come in sloped versions.Made out of the same material as the bumper component hidden behind the fascia on a modern automobile, the Pro-Ring grade adjustment system acts as a shock absorber offering the highest quality product available.

Weighing from 3 to 12 pounds, the EPP system is approximately 1/20th the weight of comparable concrete systems, enabling one individual to install or repair a square or rectangular basin using construction adhesive. The grade system also can be layered for precise adjustment.

Contact our experts for help

Cretex Customer Testimonials

“My career in Wastewater for the City Of Kerrville began early 2001. During this 15 plus year employment as Collection Foreman, I have seen every type of adjustable ring come and go. From concrete to plastic and even the vulcanized rubber rings. Nothing has been easier, quicker or less intensive on my manpower as the Pro-Ring. They have stood up to side streets and highways alike with a ZERO failure rate.  And with the extreme light weight, loading and setting them is no longer a hassle. Thanks Pro Ring!”

Matthew Zapata, Water Reclamation Collection Foreman - City of Kerrville, TX

“Bill just wanted to send you a short note about Pro-Ring.  As you know we had a trial project with these in the Pima County area with a local contractor.  The product ordering experience was great and product shipped in a good, timely manner.  The success of that project has been a determining factor for us at Dana Kepner Tucson that we have decided to stock the various Pro-Rings keeping an inventory for our contractors.  As I stated–the ordering experience was great with the stock inventory being ship quickly.  We look forward to this product being a mainstay inventory and look forward to its usages in the Pima County areas and others.  We feel this product will be a profitable experience for Dana Kepner and look forward to future business with Pro Ring.”

Terry Spencer, Branch Manager - Dana Kepner - Tucson, AZ

“Also, for reference on the PRO-RING’s as to the cost benefit – PRO-RING at $90 ea. Vs. concrete grade rings at $20 each. Yesterday afternoon my crew used the PRO-RING’s to replace and adjust two manhole castings. From the time they starting cutting the asphalt, removed it, removed the old castings, set the PRO-RING’s to grade, bolted the new castings in, backfilled, compacted and paved – 1 hour.   Job done and we don’t have to go back.  With the concrete rings, you can never really get the angle and grade set nice without mixing up concrete and tapping it correct, then you need to wait for the concrete to set up, at least an hour, backfill, then grout in the concrete riser rings.   Even using quickset, once you put a compactor to the gravel around it, you are hoping the concrete doesn’t move.  It was 2hrs per manhole with that system.   Crew cost is pushing $300+/hr with overhead and equipment.  More if you need traffic control/flagging on a busier roadway, not to mention the longer you are out there the more you are disrupting traffic.  The crews love the PRO-RING system. It’s fast, easy and leaves a perfect finish to grade.  It’s light weight and easy to install.”

James Storey, Utility Supervisor - District of Maple Ridge, BC

“Installation went very good.  We have four or five we will be setting tomorrow.  I will also then be placing my second order for more rings. The guys really love them since they are so lightweight and easy to work with!”

Chad J. Scheinoha Highway Superintendent Highway Department