You had to have quite specific plumbing connections for the sink to drain into the standpipe, but it was a dedicated drain. GE never called it a bar sink, but rather a laundry sink for situations where space did not allow for a laundry sink. I think it could have been designed in response to new homes built without laundry rooms with the laundry maybe in a hall closet or something and the dryer was low enough to allow for an uninterrupted stretch of counter space on top of it for folding or something, much like the Westinghouse Space Mates could be put under a counter. It does seem rather fanciful now, but you have to remember, the early 60s were a time of great optimisn, imagination and innovation and at General Electric, Progress was their Most Important Product, second only to keeping unions out of the workplace.