also know where your main shutoff valve is located, even if you don’t plan to use it.
Important: Turning off the water supply does not automatically drain the plumbing system or remove water from the P-traps beneath your sinks. Those traps usually retain their water seals unless the water evaporates, leaks away, or is otherwise removed.
What About Pouring Oil or Other Substances Down the Drain?
Some online tips recommend pouring cooking oil, mineral oil, or other substances into a sink before leaving to slow evaporation or block odors.
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