• 8 API 12F flange connections top and bottom.
  • Usually angled to accommodate 12:1 roof pitch. Also available straight.
  • Allows easier external access to vent bolt connections.
  • Pipe ID suitable to accommodate Series 4000 Marsh Hawk installation.


  • Different flange connections top and bottom to adapt an existing tank connection to a particular vent.
  • Allows easier external access to vent bolt connections.
  • Better accommodates torch cut roof vent connections for improved sealing performance.

Bolt Rings

  • Provides drop-on installation of a Series 4000 Marsh Hawk directly onto a tank roof or other applications where the fasteners may be inaccessible.

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Ordering Information

Most Risers, spools and bolt rings are stocked.  Refer to the brochure for ordering options.

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