... up! With our suction cup, single or double or four, just fasten the suction pads to any non-porous surface and move ... , place it, transport it... you decide.For the Four Head Suction Cup Lifters, press the levers down to create a strong, continuous hold ... the atmosphere on the outside of the cup, and the low-pressure cavity on the inside of the cup, is what keeps the cup adhered to the surface. Four ...