This kit is designed for use where your dryer is mounted directly on the inside of an external wall. It takes the air directly out the back of the dryer sdtraight through the wall. There is no tubes running anywhere
This is a genuine product marketed by Electrolux (who are simpson and westinghouse) It comes with the adapter at the back of the dryer, and the through-the-wall kit consisting of a steel tube and louvre.
It will fit every model of simpson or westinghouse dryer sold in Australia in the past 25 years.