Suction Cover Filter for the Suction Assembly used on2003-2008+ SUNDANCE® Spas. Figure 1 Only. 6540-213 (Click the diagram on the left for a larger, actual image) NOTE: It is important to keep these Filters on your Suction Covers to avoid dirt and sand from being sucked into your Diverter Assembly, causing your diverter to seize up and become hard to turn.