Square manhole adjustment

Based on the success and acceptance of the round PRO-RING™ Manhole Grade Adjustment System, Cretex now offers square and rectangular PRO-RING™ systems. These new products are manufactured from the same engineered polymer, expanded polypropylene (EPP), as the round versions and meet the loading requirements of AASHTO HS-25. EPP is renowned for its exceptional strength-to-weight ratio, chemical resistance, durability and long service life. PRO-RING™ is approximately 1/20th the weight of concrete grade rings, which makes them easier to handle, safer and reduces the risk of worker injury.

Cretex Specialty Products

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