Description
Sizes available 4″, 7″, 11″, 15″, 19″ tall and 30″ in diameter.
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.
