I am looking to purchase a "vintage" concrete sink to use as a garage utility sink in a new home we are building. I'd like to get one that is in great shape from a local architectural salvage yard. The thing is heavier than all get out but manageable. I'm fairly handy with resurfacing and am not overly worried about that part. I would like to get some expertise from someone who may know how to remove and replace the old drainage system on these. From what I've seen from looking around, people simply bust out these old concrete sinks and put in a cheap looking plastic tub. Effective, but not what I'm looking to do. I'd like to go into this project with a little foreknowledge from someone who may have attempted and been successful at this in the past.

The drain is a fairly standard setup for a double basin concrete tub from what I've seen around. There is a drain in bot tubs, near the mid-line that merge and then exit through a common outlet in the bottom. Here is a picture of that common outlet...

There appears to be some very rusted bolts holding a flange piece on to a fitting that is secured to the sink with a "sealant" material.

My plan would be to remove this whole thing by cutting or scraping out the "sealant" material to remove the drain from the sink.

Assuming that went well, I'd replace it with a retrofit drain that I'd have to either find or fabricate myself. That is where I believe I'd run into the most trouble. As for the drain on the top side of the sink, I believe I shouldn't have a huge issue finding screen or lattice drains that I can silicone into place to give the top side a finished look.

We're not looking for the prettiest sink here as it is going into the garage, but we appreciate the longevity of these sinks and the craftsmanship that made them last as long as they have.

Any help here would be greatly appreciated.

Thank you!