The cost to replace a faulty diverter valve depends on whether it is an exterior tub spout or an in-wall valve. Replacing a standard tub spout diverter costs $20 to $50 in parts for a DIY fix, or $175 to $350 if hired out to a plumber. Replacing an entire in-wall shower diverter valve body requires professional plumbing labor and drywall work, with total costs ranging from $350 to $800+. Verification: Inspect the new installation under pressure to ensure zero leaks.
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