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Whether replacing an old manhole riser installation or working on a new project, the Whirlygig is a revolutionary method of manhole riser/collar installation. A patented process, it is size accurate, installed in minutes and leaves no doubt about quality control. Cast-in-place on site, our manhole riser/collar system is ideal for new construction or rehab projects. The WHIRLyGIG system is easy to install so please watch our video at www.wgig.us.
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