What do I use to plug this drain in my floor?

I just removed an old crappy shower stall that was in my basement. There was obviously a floor drain plumbed to it.

I want to plug this hole. What do I use? It's 4" in diameter.

The concrete is tapered towards that hole but I don't really care about that. I'm not going to patch it and try to make it smooth and level. Never know when I'll have to put a shower or toilet back again.

Thanks.

They do make mechanical plugs if you want it temorary.

Or you could plug the pipe with newpaper and pour a concrete patch over it.

Thanks for the reply and info.

I'll stop by Home Depot and pick up one of those plugs.

I suppose I could always pour concrete over the plug if I feel the need to level it out.