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engineering specs
Engineered expansion screw allows for precise +/- ¾” diameter adjustments on the fly, guaranteeing a perfect fit in irregular manhole frames.
Despite being adjustable, the main ring maintains exceptional structural integrity, rated to handle 50-Ton localized shock loads without buckling.
Available in standard starting diameters from 24" up to 36", with rise increments available from 1" up to 6" for deep paving lifts.
Select the optimal material finish for your environmental requirements.
Industrial standard for general municipal applications.
Resists corrosion from road salt and extreme weather.
Heavy-duty foundry cast finish for ultimate durability.