Sink Buddy is a sink that only appears briefly in the episode "Bubble Buddy."
Role in episode
Sink Buddy appears when none of SpongeBob's friends want to play with him. As a result, he resorts to befriending inanimate objects. SpongeBob first tries Stick Buddy, which he drops on the ground. Next, he tries Rock Buddy, which does not do anything. Then he tries Sink Buddy, which also does not do anything. Finally, he creates Bubble Buddy.