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Heavy Duty Manhole Cover Catalog Precast Heavy Duty Manhole Cover Heavy Duty Manhole Cover Description Septic Tank / Distribution Box / Drywell Straight Type Frame CIMHC - #1310A 24" Cast Iron Man Hole Solid Cover Design FeaturesMaterials: Gray Iron (CL35B) Design Load: Heavy Duty Open Area: 182 sq. in Coating: Undipped Designates Machined SurfaceCertification: ASTM A48 Disclaimer: Weights (lbs/kg), dimensions (inches/mm) and drawings provided for your guidance. We reserve the right to modify specifications without prior notice. Spec Sheet Download a Copy of this Page Rates Please contact us for current pricing and availability. Request Availability