Select inside/hidden surface (for pushpull)

Hey, How do I select a hidden/inside surface? In this case so I can pushpull.

I want to pull the right end of the highlighted object to match the side of the left object

Seems to work as expected here with sub object selection

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Hummm, guess I should have caped the beam first… thanks for the help, sorry about wasting your time.

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This case reminds me that it would be great if the sub-object selection also offers to select the entire border of an opened polysurface with a single mouse click.