Yes, you must shut off the main water supply to your house before replacing a bathtub mixing faucet or a wall-mounted tub spout assembly. Failing to shut off the water supply will result in pressurized water spraying out uncontrollably from the open pipe once the fixture is unthreaded or unbolted. 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 old fixtures.
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