The PRO-RING concrete-alternative manhole and catch basin grade adjustment system from Cretex Specialty Products is available in round, square and rectangular systems. It is manufactured from expanded polypropylene, which is renowned for its exceptional strength-to-weight ratio, durability, chemical resistance and long service life under harsh conditions.  One man can install the system in just minutes to within 1/4 inch of finished grade, and they are watertight. Where concrete rings break and may cause injury, the system eliminates the hazard, helping minimize the risk of injury. It dramatically speeds manhole installation and repair time. 800/345-3764; www.cretexseals.com; Booth 641.