The the treads on the drain plug receptacle on our main clean out have
become bad. The plug will no longer seal. I have a rubber test plug and
TFE dope sealing it now, but what should I do long term?
take a wire brush and run it into the threads and run the brush around..
this will get all the rust out of the old cast iron fitting.. if this
does not work then you can use the tool that is made for this to clear
you then use the correct plug for it....
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