SR540/SR800 Extension Tube is 10.25" Tall. It comes with high-temperature silicone bands for the bottom and one double lip seal for the midsection. This glass extension tube is made to help the SR540/SR800 with bean movement and better heat output. This tube is to be used with the original chamber and chaff basket. This SR540/SR800 Extension tube will allow the machine to run on lower fan and heat settings once the beans get lighter in weight. We usually finish with FAN 2, and HEAT 1. This will be very useful for any users that have a harder time with their supply voltage being slightly inadequate.