From Work Tunnel To Wastewater Transmission Tunnel It takes creative engineering to construct and test a tightly ?tted pipeline inside a long, skinny tunnel. DuraShield linings and coatings were tough enough to handle foot traf?c and equipment dragged across its surface.   AWWA C222 industry standard compliant for interior and exterior of steel water pipe and ?ttings. NSF Standard 61 certi?ed formulation of LifeLast DuraShield for NSF/ANSI drin

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