An outdoor sink may sit unused for months, and its supply and drain can be exposed to cold weather. A plumber can design the setup around the climate, the available connections, and how the sink will be shut down between seasons.
Identify where the water and waste lines run
Share the sink location and note which sections will be above ground or exposed. Ask where the supply can be isolated and how the fixture will connect to an approved drain. Keep the design and equipment instructions with your project records.
Ask for a shutdown and restart checklist
Have the installer identify the valves and explain what needs to be drained for your installation. Ask how the sink will be checked for leaks before it returns to use. Avoid assuming the procedure from another fixture fits this setup.
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