Manhole Grade Adjustment Rings


We have over 70 years of experience in manufacturing rings for all types of applications.

We offer rectangular, square, and round rings in a variety of sizes. For your grade ring needs, please call today.

Rectangular and Square(Inside Dimensions)


  • 20” by 26” (type A) (2" thick)
  • 25” by 25” (type B) (2"and 4" thick)
  • 21” by 24” (2" thick)
  • 24” by 36” (2", 4", and 6" thick)


Round(Inside Diameter)


  • 26” (2"and 4" thick)
  • 28” (1", 2", and 4" thick)
  • 30” (1", 2", and 4" thick)
  • 36” (2", 4", 8" thick)
  • 36" w/Epoxy Coated Reinforcing Rebar(2", 4" thick)