Not necessarily, as many handy homeowners can install modern threaded or push-to-connect water hammer arrestors themselves without professional help, especially if the arrestors attach directly to accessible shut-off valves beneath sinks or behind washing machine hoses. However, if your water hammer originates from fast-closing shower valves, main supply lines, or requires cutting into rigid copper pipes inside finished walls to solder new arrestors inline, hiring a licensed professional plumber is strongly recommended to ensure code compliance and prevent accidental leaks. Verification: Pressure test the newly installed connection with water to confirm zero leaks.
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