A drain snake or auger often refuses to go down a bathtub drain because the flexible metal cable hits a sharp 90-degree bend at the sanitary tee fitting behind the overflow pipe or encounters the tight curve of the P-trap. If you feed the snake directly through the tiny vertical drain basket instead of removing the overflow plate, the cable will bind immediately against the stopper mechanism or crossbars. Verification: Remove the overflow plate and feed your drain snake down through the open overflow pipe for a smoother path.
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