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Marine Manhole Covers

Valley Nut & Bolt supplies high-quality marine manhole covers designed for use in shipbuilding, offshore platforms, and other marine environments where durability, watertight integrity, and corrosion resistance are critical. Our covers are available in various sizes and configurations, including bolted, hinged, and quick-access designs, and are manufactured to meet industry standards for strength and performance.

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Oval steel plate secured with a ring of brass hex nuts and bolts, custom fabricated by Valley Nut & Bolt.

Available Styles

  • Oval
  • Round
  • Square
  • Flush Mount
  • With or without Combing
  • Studs or Flat Heads
  • Drop Handles

Material Options

Offered in materials such as carbon steel, stainless steel, and aluminum—with coatings including hot-dip galvanized and marine-grade finishes—our manhole covers provide long-lasting reliability in harsh, saltwater conditions. Custom fabrication options are also available to meet specific vessel or project requirements.

Manhole Covers Gallery

Industries Served

  • Construction
  • Heavy Industrial
  • Infrastructure
  • Manufacturing
  • Government
  • Marine
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360-754-4877

Assorted screws and fasteners representing Valley Nut & Bolt's product line.