Thats because the sentria and avalir are basically the same machine. The only real difference is the color scheme and pattern scheme and the name. Otherwise its the same machine that weve had for almost 18 years, on a platform that we've had for almost 34 years. Both sentria and avalir use the same motor, as does all other kirby's, same headlights,same power nozzle belt lifter, and so on. In fact I'm curious to why kirby went back with the plastic belt lifter on the avalir 2 instead of using the chrome one that they've been using since 2006 (original sentria).