A drainage system for use in a bathtub, sink, or the like. A bathtub may include a bath basin and a basin drain that drains water from the bath basin. The drainage system forms a p-trap. The drainage system includes an inlet elbow having an inlet and an outlet. The inlet is fluidly connected to an outlet of the basin drain. The drainage system also includes a u-bend conduit having an inlet and an outlet. The inlet is fluidly connected to the outlet of the first elbow. The drainage system also includes a second elbow having an inlet and an outlet. The inlet is fluidly connected to the outlet of the u-bend conduit. The outlet is configured to connect to an inlet of a fluid drain.