I tracked down a tub leak coming from where the brass tub drain/overflow assembly connects with the ABS drain pipe (installed 30+ years ago). This will make the third similar repair I have done within the last 18 months. Is this typical for a 30+ year old house?

Since I had to cut into the ceiling below to get to the leak, I thought it wise to replace the entire tub drain assembly. Do you agree? The old brass assembly one doesn't look too bad, but I'd like a professional's opinion.

In case it must be replaced, are there any advantage to using the brass over PVC (besides cost)? I have read the numerous responses regarding copper versus PVC for water, but does the same logic apply to this? My initial thought is that brass would be better, but upon reflection, I though the PVC might be better as it may allow a little "give" in regards to expansion/contraction and vibration. When I looked at the local home supply store, the only PVC option for the tub drain assembly was the tub drain kits made from the thin PVC pipe (which seems kind of flimsy).

Given the effort to get at the leak, cost is really not a consideration as much as long-term integrity (although I do not have $'s burning a hole in my pocket either).

Finally, due you have any experience/suggestions regarding the use of the classic tub drain (with handle) versus the more modern push/plug type?

Thanks in advance.

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I tracked down a tub leak coming from where the brass tub drain/overflow assembly connects with the ABS drain pipe

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Are you saying the leak is where the brass drain connects to the trap raiser?

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Since I had to cut into the ceiling below to get to the leak,

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A tub access panel was never installed behind the front of the tub? Don't cut the ceiling, cut in a access panel.

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the numerous responses regarding copper versus PVC for water, but does the same logic apply to this? My initial thought is that brass would be better, but upon reflection, I though the PVC might be better as it may allow a little "give" in regards to expansion/contraction and vibration. When I looked at the local home supply store, the only PVC option for the tub drain assembly was the tub drain kits made from the thin PVC pipe (which seems kind of flimsy).

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Either brass or PVC will be acceptable.

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Finally, due you have any experience/suggestions regarding the use of the classic tub drain (with handle) versus the more modern push/plug type?

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They both will do the same function so It's up to the individual. I like the lever type myself. Good luck, Tom

Suggest that you post a few pics. That wold help a lot understanding what the problem might be.