DRAIN SYSTEMS

A drain pipe system having a drain pipe assembly including a connector bushing, a first straight coupler, a reducing coupler, a second straight coupler, and a 90 degree elbow; wherein the connector bushing, the first straight coupler, the reducing coupler, the second straight coupler, and the 90 degree elbow are coupled in respective series as the drain pipe assembly configured for connection between a recreational vehicle and a wastewater collection system.