104C Composite Cover Manholes

The OPW 104C 20" (500mm) Composite Cover Manholes allow easy access to UST monitoring equipment and provide additional space for electrical junction boxes.

Download the 104C Composite Cover Manhole Catalog Page

20" Cover

20" Cover

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  • Features
  • Ordering Specifications
  • Replacement Parts
  • Downloads


  • Lightweight Cover - Provides safe, easy removal and replacement.
  • Durable Composite Construction - Never rusts, fades or needs to be painted.
  • Spark-Free Cover Design - Fiberglass construction eliminates the possibility of sparks caused by replacing cover on mounting ring.
  • Flush-Mount, Rolled Steel Mounting Ring - Eliminates the need for sloping concrete to reduce snow plow and traffic hazards.
  • Highway 20 Rated (H20) - All OPW spill containers and manholes exceed the requirements of the Highway 20 rating.

Typical Underground Storage Tank Manhole Layout

Ordering Specifications

Product # ID (in.) ID (mm) lbs. kg
104C-2000 20 500 22 10.0


Product Number A B C
in. cm in. cm in. cm
104C-2000 19 48.26 20-3/4 52.7 11 27.9

Replacement Parts

Part #
Cover for 104C-2000