Grade Adjustment System Offers Long-Term Seal to Wisconsin Utility

In undertaking any rehabilitation project, the hope is that you and your crew won’t be back at that job site again anytime soon. That’s why it’s important to choose a solution that can withstand the test of time.In the early winter of 2009, Cretex Specialty Products of Waukesha, Wisconsin, was looking for field test sites for a new product that was ready to be introduced to the underground construction market. That new product was the PRO-RING manhole and catch basin grade adjustment system.The PRO-RING is the world’s first and only grade adjustment system made from expanded polypropylene — the same