The Manhole Riser/Collar System from Whirlygig replaces concrete grade/adjusting rings, stuffings and grout with a molded thermo-plastic form, pre-trimmed to the final grade. The radial form trimmer indexes off the adjacent pavement to automatically set the cutter to trim the form at the proper height and orientation. The forms are available in various sizes and heights and weigh less than 1 lb. per inch of height.
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