the P-trap contains water.
You can then place a drain stopper over the opening if you want an additional barrier against odors and debris.
For sinks that aren’t used regularly, this can be particularly useful.
What About Bathroom Sinks?
Bathroom sinks can be treated in the same general way.
Run the faucet briefly before leaving, then close the drain stopper if your sink has one.
If the sink has a removable stopper, make sure it is clean and seated properly.
You don’t need to create an elaborate seal unless you
