Whether replacing an old manhole riser installation or working on a new project, the Whirlygig system is for you!
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.
Over 90 thousand installations across America.