Waste Line Q: Cleanout plug not closing tightly

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My cleanout plug is not closing tightly on the trap of the house’s main waste line; there is a 1/2″ gap. Odors escape from it.  Do you know if (1) the black rubber gasket is supposed to seal tightly or (2) it is not but there should be a layer of horse hair or hemp in between the plug & gasket and the trap?   I think the gasket is supposed to seal and used to do so.  I think I removed it and did not put it back tightly enough, which enabled rust to build up inside the trap, and which now prevents the plug from descending the final 1/2″ that it is supposed to and used to.  The height of my plug is 3-1/2″, and so is the height on the inside of the trap piece from its exterior top down to the top on the narrower inner diameter.  I think the rust is on the angled part of the trap.  Please let me know if my theory is totally wrong.  If I am correct, what is the best fix?  Switch my plug for a 3″ high one?  Is there supposed something like horsehair or hemp in there, as a secondary seal?   Thanks in advance.

renoishard2

in Plumbers and Plumbing 13 years and 3 months ago

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eman134 | 13 years and 3 months ago

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remove the plug, insert the rubber seal all the way into the trap, and thump the plug back in with a block of wood and a small sledge