There are no visible exterior screws

Chrome-plated plastic knob

Built-in GPS

rotary switch and a unique long double spray nozzle to reach over thick windscreen frame

High-velocity 3-speed blower

Vetus NSF25 - Odour filter with 25mm (1") hose connection Perko There are no visible exteriorEach waste water tank requires an air breather line, through which unpleasant odours may escape. This can be prevented by installing a VETUS no smell filter into the breather line. The no smell filter element contains a special odour absorbing material. The filter can be installed very easily. Model NSF25 is suitable for a 25mm diameter breather hose. The filter element is exchangeable and should be renewed once a year.