• manhole risers excavation
    After excavation, place the Whirlygig Form on the top of the cone.

THE BEST-IN-CLASS MANHOLE RISER/COLLAR SYSTEM

Order Online!

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. 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 200,000 installations across America and growing every year!

The Whirlygig system is:

  • Easy to install. Please watch our video on this page where each step of the process is explained in full detail. You will be amazed!
  • Streamlined installation is a snap and works everytime.
  • Sturdy - Our high quality pre-formed thermoplastic form is constructed to outlast any other system available.
  • Please see our Specifications Page for compete details.

Have Questions? We would love to hear from you

Contact Us