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I recently bought a new house and I'm having issues plugging my bathtub drain. The drain appears to be designed for a pop up plug of some kind, which is missing. I'm not sure what make or model the drain is so identifying that is probably step one, so I've taken some pictures:

The spout, overflow, and drain: enter image description here The only identifying markings are an "SA" on the overflow cap.

The faucet handle, mounted above the spout, says Delta Monitor. Faucet Handle, Spout The gold handle controls flow rate, the black center piece (not original I assume) rotates independently and controls temperature.

Close up of the drain: Drain When you rotate the overflow cap, there is a small brass looking rod down inside the drain that moves up and down a small amount.

I don't know the history of all these parts, and I don't know if they're part of a series (i.e. are all Delta Monitor), or if they were bought piecemeal. I also don't know what generation of the Monitor series these are, or how old any of this is. My guess is 1980s but could be 70s or 90s as well. Doubt it's from after 2000.

I've tried a universal tub plug 1 1/2" tub stopper but the drop from rim of the drain to the three-prong part is shallow enough that the stopper stands up off the rim of the drain and lets water out:

Stopper

Finally, I've tried one of those big flat suction stoppers and that also doesn't work great because the drain is quite close to the end of the bathtub and the curve between bottom of the tub and end wall is quite sharp so the suction stopper won't sit flat.

Any ideas on what type of stopper is supposed to be used with this thing would be much appreciated. Or thoughts on how to properly identify the drain make/model.

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    Rubber stoppers come in many shapes & sizes, or you can just cut off the part that's too long on the one you already own. That's probably going to be a good long-term solution, too - figure that the original failed in some way before you met it, so the odds of it failing again if you do find the exact parts to restore it to original condition are pretty good...sometimes an overly complicated approach to a simple problem is poorly engineered. – Ecnerwal Jul 24 at 2:50
  • That part that sticks out is to prevent it from sliding sideways. Cutting that shorter won't affect it much. Just make sure you don't cut your hands. – Nelson Jul 24 at 5:48
  • duckduckgo.com/… – jsotola Jul 24 at 6:11
  • @Ecnerwal Thanks for the suggestion. I've actually already cut the plug I showed shorter and that's working OK. I was just hoping to find the correct fixture to get a better seal (i.e. not something that's easily knocked out of place by a foot which is the case with the cut plug). – SSilk Jul 24 at 13:13

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