The Glass Extension Tube will help the performance of your SR300, SR340, SR500, and SR700 coffee roasters. There are two silicone rings that help prevent air loss from the fan. The glass tube helps bean movement during the entire roast. User must be cautious when using the roast chamber extension. Machine will be very top heavy and do not move the machine assembled.*Purchase price is for the glass tube and silicone rings ONLY.
*Does not work with the SR540