Remember Accon Marine flush-mount tie-downs? Come on, folks, it was just last week! This thing:

Anyway, I heard from Erica Ring at Accon, and here’s what she had to say:

To answer your questions:

Yes, it is more like one big hole and four smaller screw holes.  The easiest way to install would be to use a hole saw for the big hole and drop the tie down in to mark the other 4 holes.

 

The sealing cup is to prevent water from getting behind the tie down.  It just drops into the hole and is secured along with the tie down by the four screws.

I hope this clears things up.  If not, please let me know and I will try to clarify

Got it. Thanks, Erica!