Why use Knutson Manhole Inserts?

  • Knutson manhole inserts are manufactured from corrosion-proof material suitable for atmospheres containing hydrogen sulfide Feature.
  • The inserts eliminate water run-off from entering sewer collection systems at the manholes.
  • Keeps dirt and debris out of sewer collection system and controls sewer odors.
  • Excellent for electrical and telecommunication manholes.
  • Manufactured of high density, high molecular weight polyethylene, which eliminates brittleness, caused by cold temperatures.
  • Ten year guarantee against manufacturer defects (does not cover valve, handle or gasket).
  • Ventilation by valve or vent hole and no corrosive parts.
  • Certified engineering reports from Southwest Research Institute available upon request.




JC Utilities Sales, Inc.

9656 Liptonshire, Dallas, TX 75238 | Tel: 214-340-7866 or 214-340-4226 | Fax: 214-343-7105 - This email address is being protected from spambots. You need JavaScript enabled to view it.