Pipes were hollow cylinders used to pass objects or fluid from one point to another. They were made from various materials, such as plastic or metal, and came in various sizes and shapes.
Kevin McCallister used a large metal pipe as a trap in Rob McCallister's brownstone house. Knowing that Harry Lyme and Marv Murchins would avoid his paint cans at the staircase, he hurled the hidden pipe down at the burglars. The pipe knocked Harry and Marv into the basement before Kevin cut the rope that bound it to the second floor's railing, sending the pipe rolling down the stairs and to the basement with them.