O-Ring Flanges (2″ Locking Series)


O-ring sealing flange for the 2″ Series Watertight Enclosure. These are the second generation of these flanges with a locking cord and anti-rotation feature. Compatible with dome end caps, flat end caps, and custom end caps. Includes locking cord and O-rings.

If you’re looking for a complete underwater enclosure, check out the Watertight Enclosure Configuration page.

HS Code: 7616.10.70.30

Product Description

The O-ring Flange seals to a tube on one end and to an end cap on the other. These are used with our flat end caps and dome end caps to create a high-pressure watertight interface to the enclosure tube. The flange can be used with custom made end caps as well.

These second generation flanges are anodized aluminum and include dual radial O-rings and a face seal O-ring for reliable high-pressure sealing, a locking cord gland, and an anti-rotation feature. It comes with PTFE locking cord and locking cord handles to secure the flange to the tube. These flanges are only compatible with our watertight enclosure tubes, which have precision machined features at each end to interface with the flange.

The flange installed in a tube with the locking cord.

The flange installed in a tube with the locking cord.

Four internal mounting holes make it easy to attach internal contents securely. This feature is used on the BlueROV2 to hold the electronics tray.

The flanges are available individually here, but you can configure a complete watertight enclosure from the watertight enclosure configuration page.



  • 1 x Flange (based on selection)
  • 3 x O-ring (-030 size)
  • 1 x PTFE Locking Cord with Locking Cord Handle


Material6061-T6 Aluminum
Depth RatingDepth Rating in Product Selection Dropdown

2D Drawings



3D Models


Revision History

19 November 2019

  • R1 – Initial release


Watertight Enclosure (WTE) Assembly (New)

Learn how to quickly assemble a watertight enclosure!

Using the Vacuum Test Plug

Ensure the o-ring seals are good on our WTE with this quick test!


Blue Robotics Forums – Watertight Enclosures