Type M H-20 Drainage Frame

MSU M H-20 hatches are designed to be cast into place in areas exposed to occasional traffic loads or where water infiltration and drainage into the access opening is a concern. These hatches are a flush design and support occasional traffic loads and are reinforced for AASHTO H-20-wheel loading.

Safety controls are engineered right into all MSU access hatches.

M H-20 access hatches are:

  • Aluminum or stainless steel, types 304 or 316, construction
  • Gasketed angle frame
  • Welded drain coupling and ABS fittings
  • Slip resistant checker plate lid
  • Hold-open arm, in type 316 stainless steel, locks lid safely at 90 degrees vertical
  • Continuous hinges 316 stainless steel with all countersunk fasteners
  • Lifting spring in 316 stainless steel
  • Compartment latch in type 316 stainless steel with sealing plug and opener
  • Recessed padlock hasp (padlock by others)
  • Reinforced for AASHTO-H20 Wheel loading
  • Continuous flange anchor
  • Bituminous paint on all areas in contact with concrete
  • All fasteners in stainless steel, type 316
  • Welding to CSA W47.1 and CSA W47.2


MSU M H-20 hatches are manufactured in single and double and parallel-door units.
M H-20 Single-Door Unit 900 x 900
MD H-20 Double Door Unit 1200 x 1200
**Sizes shown are examples only**


Available in Stainless Steel, types 304 or 316


  • Stainless steel, types 304 and 316
  • Insulation with back pan (Styrofoam sm 50 mm standard)
  • Custom signage, lettering and wording
  • Custom finishes: anodizing, painting