Do you have a bathroom sink without a plug?  This can be a pain if you would like to fill your sink with water or if you tend to drop things in the sink.  There is a specific part made for this problem in the bathroom.  Its called a pop-up assembly.  You can purchase one of these at your local hardware store or on the internet.  They usually have easy to follow directions included….make sure to follow the directions for the type of sink you have.  Stainless steel sinks take a plumbers putty seal, whereas a cultured marble will usually take the rubber seal included with the pop-up assembly.  Also remember to test your work, plumbing can be frustrating, just remember patience will serve you well with these sort of tasks.  Here is a picture of a pop-up assembly:

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