When I first moved here, I needed a rubber plug to plug up the laundry sink once in a while. Either there was one here already or I bought one. It was hollow.
After 31 years, it started leaking at the sides, and it was hard to find one the right diameter. HD didn't have one, but Ace had one for every
1/8".I bought the right size and now it fits so well I have to pry it out with a small screwdriver every time I want to drain t he tub.
But more interesting, the new one is not hollow. It's solid along the bottom and every time I use it, still after 6 months, it strongly reminds me of the house I was born into and lived until I was 10, in
1957, and its basement. . I guess the laundry sink there had a solid plug too, and I haven't seen one since then.That sink was cement iirc with a front that was slanted backwards iirc.