On the Desk today we have a MUD all-weather heater intake cowl. The all-weather cowl will prevent snow, sand, mud and leaves from entering the heater intake and reducing the Defender heater performance. The heater intake system is fitted with a water trap whose one-way valve is designed to allow water that enters the intake to escape. In reality this one-way valve collects debris and eventually blocks with sludge. Fitting the all-weather cowl prevents moisture build-up within the intake system.