cretex pro ring

Manhole Adjustment Rings


PRO-RING is the world’s first and only manhole grade adjustment rings made from Expanded Polypropylene (EPP), the same engineered polymer material that has been used in the automotive industry since the 1980s. 25-year warranty.

manhole adjustment rings

the choice is easy

manhole rings

PRO-RING is The Proven Concrete Ring Alternative

PRO-RING products provide a proven alternative to concrete grade or adjustment rings and are the most advanced concrete ring alternative manhole grade-adjustment system available anywhere. Made of Expanded Polypropylene, PRO-RING is known for its ability to stand up to the harshest conditions without damage or deformity for 50 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. In addition, the PRO-RING is DOT-approved in 25 states and designed to last a lifetime.


Get More Done For Less

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. People are amazed at our demonstrations when one person can install an entire PRO-RING system in just minutes. The adjustment system is easy to assemble, watertight, and installed within one-quarter inch of the desired elevation. Our angle ring allows speedy conformity to sloped road surfaces. Additionally, no water, sand mortar, or bricks are needed, just simple tools. Check out some of our case studies to learn more.


Helping You Reduce Comp Claims.

It usually takes two to four men to lift a concrete grade ring, each risking back injury. A six-inch PRO-RING weighs only 14 pounds. The ability to hand-carry the manhole adjustment rings into backyards, easements, and remote locations, makes the overall process safer and less disruptive. Where concrete rings break and can cause injury, the PRO-RING™ system minimizes that hazard, helping reduce comp claims. Download our brochure to learn more.


One Man Can Easily Install the PRO-RING System in Minutes.

On average, a typical concrete grade ring weighs 40 to 70 pounds per vertical inch making PRO-RING almost 20 times (95%) lighter. The PRO-RING can literally be lifted with your finger. ARPRO® Expanded Polypropylene has been used for challenging automotive applications and is renowned for its exceptional strength-to-weight ratio. EPP is not only durable, it has excellent chemical resistance and a long service life under the harshest conditions.

Are there additional advantages of the PRO-RING system? Absolutely, and we invite you to read about them. Or, see the advantages first-hand by requesting a free product demonstration. You’ll get to work directly with our team and the PRO-RING, while solving an I&I challenge in your area.

manhole adjustment rings


Cost Savings Everywhere You Look!

They say time is money; see for yourself how the PRO-RING system dramatically reduces the time and equipment required to construct or reconstruct a single manhole adjustment. Manhole repair sites can be opened and closed in a single day or in a few hours, depending on pavement type and site conditions. Closure results in significant savings and minimizes the impact on traffic when it is necessary to close traffic lanes or streets to complete the work. The use of the PRO-RING system may result in as much as 20% to 30% overall savings when considering the expected 50 Year Design Life.

PRO-RING vs Concrete Ring Calculator

lifetime savings of up to 30%