I have an old tub in a house we just bought. I can’t figure out what type of gasket I need to buy to fit on this stopper/plug. There’s no brand name. It won’t hold water. Should seat flush in drain hole but when I tried only thing that fit (o-ring for delta product from Home Depot), it was raised up too far and wouldn’t seat properly. Can someone tell me what style this plug is and what to buy to keep water in it? It just slides up and down the center post in the drain, I don’t think it stays up on its own by spinning. Just either in or out. Just want it to hold water. Help!
https://imgur.com/gallery/3Ztiyc9