Yes, you must shut off the main water supply to your house before replacing a shower diverter valve or removing a tub spout with an integrated diverter gate. Failing to shut off the water supply will result in pressurized water spraying out uncontrollably from the open pipe once the fixture is unthreaded. Callout type="warning" title="Hygiene Warning": Shut off the main home water supply before beginning plumbing disassemblies. Verification: Open a downstream sink faucet to drain residual line pressure before removing the old diverter.
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