The PRO-RING concrete-alternative manhole and catch basin grade adjustment system from Cretex Specialty Products is available in round, square and rectangular. It is manufactured from expanded polypropylene, which is known for its exceptional strength-weight ratio, durability, chemical resistance and long service life under harsh conditions. One man can install the system in just minutes to within a quarter-inch of finished grade, and they are watertight. The system eliminates the hazard of concrete rings breaking and causing injury. It can dramatically speed up manhole installation and repair time. 800/345-3764; www.cretexseals.com; Booth #1337.