My old (1940) house has a basement utility sink that has started to leak at the drain (shown in picture). Is there a way to replace the section that is rusted or do I have to rip the whole thing out and replace it? It looks like its a very different mechanism to modern utility sinks, it doesn't have a threaded base or a threaded drain strainer (just a hole). How do I go about fixing this?
Edit: From some googling, this is an old concrete tub and weighs and absolute ton.
Edit: I decided to have a professional plumber look at this and he ran water in the sink for a minute and he could see that the concrete itself was weeping a bit, so it was worth demolishing the sink and installing a new plastic one. He just took a sledgehammer to it, loaded it in a few buckets on his truck, and installed the new sink in a couple hours.