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The Astrozap 820-N-2 Flexi-Heat Dew Shield will fit optical tubes with a diameter of 231 mm. There are two notches in the shield to make room for the upper and lower dovetail bars. If you are only using one dovetail, then you can buy the AZ-820-N-1 Heated Dew Shield instead. All Astrozap Dew Shields require the use of a simple D/C adapter (AZ-719) or dual channel controller (AZ-720) to be powered.