Manhole grade adjustment system
The Cretex PRO-RING™ manhole grade adjustment system is a lightweight alternative to concrete grade rings or brick and mortar used in the construction of manholes and other utility structures. The technology is made from expanded polypropylene, which is a high-strength, impact-absorbing plastic that meets AASHTO HS-25 load requirements. PRO-RING also meets the requirements of ASTM C969 (exfiltration test) and C1244 (vacuum test), has excellent chemical resistance and is approximately 1/20th the weight of concrete grade rings.
Cretex Specialty Products
www.cretexseals.com
Booth 628