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clogged plumbing vent

  1. Clogged Plumbing Vent?

    I'm visiting my parents who live in Montgomery County, Maryland. Their 2 1/2 story split-level house was built in the late 50's and they've lived here since about 1963. At some point, they had their upstairs bathroom "remodeled" by someone I'm reasonably certain was not licensed since his work...