New sink install, weird drain.

[rusty quoin]

8. First I want to complement you on your beautiful sink.

I really like the faucet you picked out. Personally I don't like curvy brass types of things. I like angles.

The big hole should be for the drain plug assembly, which I notice you don't have, and the two smaller holes, I have no idea, or at least I've forgotten. If you go to a plumbing supply store, they will tell you right away. Sometimes when doing plumbing, I've hit the hardware store or plumbing store many times in a day to finish up a project. In fact it is the norm especially in old homes.

If you don't want the drain plug installed, and I can't tell you about the two smaller holes, you can silicone them. What would concern me is as you squeeze the silicone through, there is nothing to stop the flow of it as it will then be inside the drain, solidify, and become and obstruction for hair and stuff.

My advice has reached it's limit. Professionals can tell you what you need.

Edit: I just looked at moen vanity drain assemblies. The big hole looks nothing like it, so I really have no idea about the 3 holes...sorry.