Knowing the difference between a hose bib and sillcock is very important, especially when you are making plans to buy either of them.
Although both may look alike, you will notice that a sillcock features an extended pipe that penetrates deep into the interior parts of the house. Most sillcocks come from 6 inches to 12 inches in length and when you want to buy one, always get the longest reasonable size.
The reason that sillcocks are longer is that unlike its counterpart where the valve that controls the water is exposed to the outside, the sillcock positions the valve at the end of its long pipe.