ActronAir Drain Hose suits WRE series routes condensate from the WRE series indoor unit drain tray to the external drain outlet on WRE series wall split systems, ensuring reliable condensate removal that prevents water buildup and overflow damage to the indoor unit installation. The WRE7125 drain hose is the correct length and diameter for WRE series installations -- do not substitute with generic tubing that may kink under normal routing conditions. Ensure power is isolated before accessing any indoor unit drainage components.