12" Adjustable Flange Two Sided Porthole

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NDBP701WD 12"
Adjustable 12 Inch Porthole for Sale

12" Cast Aluminum, with Nickel finish, Port Hole Window and Inner Channel Flange.
This style is particularly suitable as working windows in many structures, as you can have a finished look on both sides.

Opens from front side, with typical porthole latching hardware that is of high quality. The backside also made of solid same nickel finish.

The frame and glass sustains outdoor rain and cold winter weather conditions.

Bonus: Also there is another glass on the backside. Both pieces of glass are removable (secured by screws) if you desired for customizing. For instance one customer removed the glass to use this porthole as a pet door.

As a retailer, we do not perform any installations.

Very well built and packaged to arrive safely.

Additional dimensions:
Porthole overall Dia: 12"
Window Dia. (front and back): 7-5/8"
Tunnel Depth: Threaded hardware included for depth of 1- 5/8" with fully finished nickel channel flange. You can also find custom fastener lengths to use for thicker applications.



Porthole can adjust to multiple sized walls and doors. Channel flange is welded to front portion of porthole and extends 1-5/8" towards back plate. If you have a thinner wall, or door, 1) just shim one or both sides when installing or 2) cut and grind channel flange to shallower depth.

If you need the depth to be more than 1-5/8", just swap out the bolts (your local hardware store) for similar, longer ones. You may want to fashion a deeper channel to give a finished look.

Also comes complete with a nice thick gasket to keep weather out.


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  • 5
    Great Quality

    Posted by Lori Welch Brown on Nov 3rd 2020

    We haven't installed yet, but it is solid. Really nice. It will be going into an interior wall, and I can't wait to see the finished product.

  • 5
    McGrath Michele

    Posted by McGrath Michele on Mar 23rd 2018

    McGrath Michele