The average cost to replace a standard tub spout shower diverter ranges from $20 to $60 for the replacement hardware if you complete the DIY installation yourself. If you hire a professional licensed plumber to replace a standard tub spout diverter or service an internal wall diverter valve, total service call and labor fees typically fall between $175 and $350. Verification: Turn on the water and operate the new diverter to ensure a tight seal and zero leaks.
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