If your tub spout continues to leak even after installing a brand-new valve cartridge, the issue is often caused by a worn-out tub spout diverter gate or excessive back-pressure restriction in the shower riser pipe. When water cannot exit freely through the showerhead due to a clogged nozzle or restricted pipe, trapped water bypasses the closed valve and leaks out of the tub spout instead. Verification: Check whether the leak stops when you unscrew and remove the showerhead entirely.
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