This is a great question and one that many of our customers have started to ask. To access the plumbing under the bathroom sink you would need to cut away the caulk from around the vanity. Once the caulk has been removed you should be able to pull the vanity out. *CAUTION - DO NOT try to pull it out with the caulk still in place. We use 3M 4000 caulk which is a semi-permanent caulk and it will rip the gelcoat if it isn't cut before removal.