The first ever power and communications grommet specifically designed for kitchens, laboratories, medical offices; any place liquids could spill. The clear rubber ring around the top forms a seal when the unit is closed, preventing water and other liquids from getting in. It is simple yet very, very effective. To use, just grab the two metal handles on the top and pull up until PCS34 “clicks” locked in place. To lower, depress the red button on bottom and push down.