Not all manhole risers are created equal. When it comes to all applications where manhole risers are needed, Whirylgig manhole riser collar system is designed as a superior choice for all clients. Whirlygig’s website does a great job educating the client on all important product information including Ashland chemical material data sheets, load strength testing information, observations and recommendations, as well as sample spec sheets for their patented collar system.
Made in Nampa, Idaho, Whirlygig has built years of trust as a leader in manhole risers for clients ranging from municipalities, communities, contractors and more. Their intuitive website allows the potential customer to calculate savings based on the number of manholes, times with your hourly cost. This then helps the customer estimate the amount of manhole risers and which sizes are needed.