Gost 8020-2016 Reinforced Concrete Support Ring (Cover), Inner Diameter Not Less Than 650 Mm, Outer Diameter Not Less 1680 Mm, Height Not Less Than 100 Mm, Lifting Rings Hooks At Least 4 Pcs., Gost 3634-99 Sewer Hatch From Polymer Material, Hatch Material: Polymer Sand Mixture; Hatch Type: T Maximum Load: 25 M; Hatch Body Diameter: 780 Mm; Hatch Body Height: 90 Mm; Manhole Cover Diameter: 630 Mm: Manhole Cover Thickness: 60 Mm; Hatch Body Weight: 22 Kg: Manhole Cover Weight: 20 Kg:
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