Whirlygig’s groundbreaking one-piece thermoplastic Riser Form revolutionizes manhole installation. Engineered to resist corrosive environments, it is lightweight—roughly 1 pound per inch of height—providing enhanced safety by reducing strain on installers’ hands and backs.
The Whirlygig Radial Arm Trimmer (RAT) was designed specifically to pair with the Riser Form and enables for seamless installation resulting in a size accurate finished product that matches the adjacent road surface without the need for shimming or other adjustments.