Unclogging a bathroom sink sounds like an easy DIY task—and it is—but some touted methods can lead you astray. ... Seal the overflow hole with your wet rag. Step 4: Form a tight seal.

So if you have a three-hole sink with the outside holes 4 inches apart, you should be able to install a single-handle bathroom faucet. However, a deck plate to cover all the holes is usually needed.