A display bin includes a tubular body and a multi-part bottom assembly. A channel-accommodating region of the device extends laterally to the drain trench. A retaining tab extends from and interconnects the inner edges of the anchoring patches. According to the inventive method, the anchors of the fastening system are driven into the building structure before application of a moisture barrier membrane. When the second waterway is closed, the water pressure switches a water converter connected to the inlet end of the valve to the first waterway to output water.