Tinker - I think the covers are removable. I did a short search and found a product similar - Flowmaster Deck Drain systems. They have a 4 inch model, however the one on our lanai is 4.5 inches across... so it may be a different manufacturer, but it looks very similar.
Since they are painted down with the decking cover material, I am currently looking for options in case I were to break one when removing it. I figured that someone else may have already done something like this...
Maybe I should talk to a pool / Patio installer to see what they use. I am sure there is a standard for The Villages.
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