A Kornea Plate is used to connect your flexible vacuum hose to your skimmer.
Connect the vac hose to the hose tail on the kornea plate.
Take off the lid of your skimmer and place the kornea plate over the top of the shaft containing the skimmer basket.
The kornea plate will form a water tight join on the top of the skimmer shaft.
The suction from the bottom of your skimmer will suck the water through the hose and you can vacuum your pool with the leaves getting trapped in the skimmer basket.