It is called Dual since the long-lasting hold is provided by the two main innovations of the product. The built-in screw increases the vacuum pressure. The rubber ring covered with polyurethane gel provides stronger hold.
Adsorption of Polyurethane Gel
The primary adsoprtion effect of the product comes from the sticky, strong, adhesion force of the polyurethane gel type rubber rings.
If the ring becomes dirty or the adhesion decreases all we have to do is clean it with neutral detergent and running water.
Vacuum Suction of Rubber Cup
The twistable cap through the screw increases the vacuum pressure in the suction cup. Thanks to this unique and patented method the product can hold up to 5kg.
Since the pressure can decrease in the system, in order to maintain the long-lasting effect of the product, the cap needs to be readjusted once a month.