Manhole Grade Adjustment System

Square and rectangular, Pro-Ring is manufactured from the engineered polymer expanded polypropylene (EPP) and meets the loading requirements of AASHTO HS-25. EPP offers exceptional strength-to-weight ratio, chemical resistance, durability and long service life. It is approximately 1/20 the weight of concrete grade rings. It is easy to handle, safe and helps to reduce the risk of worker injury.