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Precast Concrete - Grade N Seal
The Grade N Seal system from Terre Hill Concrete Products is the total solution for manhole to frame riser installations. The 4-way seal of Grade N Seal assures a vacuum-proof seal and eliminates inflow of wastewater and runoff into sanitary and storm water systems. Laboratory tests prove that Grade N Seal is stronger than concrete, brick and mortar and can withstand extreme stress conditions.

Grade N Seal is ideal for both new construction and rehabilitation work. Each Grade N Seal kit contains all the necessary material for a fast and easy installation. That eliminates the need for ordering separate grade rings, mortar and sealant. All threaded rods, washers and nuts are included in each kit. Grade N Seal's lightweight design requires no heavy equipment, mortar mixing or stocking inventory of grade rings.  

We are proud and participating members of these organizations listed below.

Pennsylvania State Association of Township Supervisors Associated Pennsylvania Constructors National Precast Concrete Association Maryland Highway Contractors Association Associated Builders and Contractors, Inc American Road & Transportation Builders Association Utility and Transportation Contractors Association of New Jersey

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