A tub drain that fits a 2.5" drain opening?

[gus514]

I'm replacing the drain system on an older cast iron bathtub, and the drain opening at the bottom is 2.5" in diameter, which leaves a lot of extra room when a standard 1.5"drain is put in. The rubber washer at the bottom barely has any overlap with the edges of the opening, so I'm afraid it's not going to make a very good seal. Nobody seems to stock or even be able to special order any larger drain sizes.

Any suggestions?

[hj]

It could have been one of the "ancient" Kohler tubs, but they no longer make the oversized drain for theirs.

[gus514]

Thanks. I'm finding that they are impossible to find. What would you do in that situation?

[jimbo]

I think Watco and/or CS&B makes a bushing