MH Square Frame Base w/ Circular Cover (401.01)

Manufactured by Sigma Corporation
Brand: Calcutta Ferrous

Heavy duty, load bearing, grey cast iron square frame and circular cover for maintenance access. Cover stamped "Danger", "Storm", "Sanitary", or "Water" as per application.

Drainage and Sewer Works | Maintenance Hole, Catch Basin, Ditch Inlet Units and Valve Chambers | Accessories | Frames and Covers | Gray Cast Iron

Certifications: PMC - Accepted for Use Durham Region Approved Products List Region of Halton Prequalified Products List

Prequalification Lists: 
Regional Municipality of Durham - - Grey Cast Iron (PDF)
Regional Municipality of Halton - - Frames and Covers (PDF)
Regional Municipality of Halton - - Frames and Covers (PDF)
  • Ontario Provincial Standards
    • OPSD 401.010 - Cast Iron, Square Frame With Circular Closed Or Open Cover For Maintenance Holes
  • American Society for Testing and Materials
  • Other Standards