A standard bathtub overflow pipe is typically a vertical plastic (PVC) or brass tube measuring about 1.5 inches in diameter that connects the upper overflow drain opening on the tub wall down to the main sanitary tee and P-trap beneath the tub basin. It is usually concealed behind the bathroom wall, positioned directly above the floor drain trap, and attached to a rubber gasket and metal faceplate. Verification: Remove the overflow faceplate with a screwdriver to view the upper connection point visually.
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