Pneumatic visual indicators provide a visual indication of air pressure within pneumatic systems. Pneumatic visual indicators - often referred to as a 'Visiwink' is a standard industry abbreviated term for this product. Several types of pneumatic visual indicator are available in this section. Choose from panel mount or port mounted with pop-up or lens type indication. There are many colour combinations with high visibility lenses that extend beyond the panel surface to provide a clear visible indication for the presence of air pressure.