A drain assembly includes a drain body and an expanding assembly. The drain body defines an axis and includes a first flange extending away from an inner surface of the drain body toward the axis and a second flange extending away from the inner surface of the drain body toward the axis. The expanding assembly is positionable within the drain body between the first flange and the second flange. The expanding assembly includes a lattice body and a fastener. The lattice body is positionable between the first flange and the second flange and a portion of the lattice body defines an aperture extending therethrough. The fastener is adjustably coupled to the lattice body at the aperture. The fastener is configured to be adjusted relative to the lattice body such that the expanding assembly applies an axial force to the first flange and the second flange.