Specifications: 1. Casting Iron 2. Competitive price and quality 3. BV, ABS, CCS 4. International Standard Optional Model: Available in marine steel, stainless steel and aluminum alloy, copper materials Hinged type, Water tight/ Weather tight and Oil tight marine manhole covers. Embedded or Sunk Type. Smooth surface without cracks , good wear and corrosion resistance, never rust Rubber gasket three years warranty Screw: stainless Surface before painting: sandblasting Painting: Jotun or equivalent brand Customize available OEM service and Special requirement is available