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The Turner manhole extension ring is a polypropylene and fiberglass composite riser that will withstand any force found naturally on the roads. The manhole extension ring fits snugly into the manhole frame and adjusts the manhole quickly and safely. Since 1977, Turner manhole and water valve risers have been installed on thousands of projects from coast to coast of the United States and throughout Canada. Our adjustment rings have been approved and accepted by many state, county and municipal engineering departments – please click here for a current list of accepting agencies.
Whatever your size requirement, Turner Company has a solution for your adjustment needs. Turner adjustment rings are manufactured in the U.S.A. in a high-tech process of injection-molding polypropylene with fiberglass which results in a precision product that is both high-quality and durable.