I have seen cast iron stacks plugged with wood dowels but this is the first time seeing plastic pipe with plastic dowels.

Is this from having snaked??

I recommended a qualified plumber to evaluate the entire drainage system in the house.

Indications from portions of the house indicated Mr. Handyman was here.

The slope at the kitchen drain was not good!! They need to cut the main stack down to accommodate a proper slope.

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I could be wrong, but I don’t think that is going to work right.