A disk contours to the shape of the pool surface, allowing debris to pass underneath and be extracted from the pool. The Disc fits on the bottom of the pool cleaner and has a top side that must face up. This one is suitable for the Voyager Pool Cleaner. This comes standard with a new pool cleaner, but is available as a spare part. This is a genuine IPP Voyager swimming pool cleaner replacement part.This is a replacement skirt or disk for your voyager swimming pool cleaner (not poolmaid nor stealth cleaners from ipp)The disk should always lay flat on the surface of your swimming pool, if it does not then you do not get a proper clean of your pool