its a dust collection pan with a 4" hose connection, mine came with the HF dust collection starter kit but you can get them at most any woodworking store.
like this one at Penn states:
http://www.pennstateind.com/store/dt2.html
or Rockler:
http://www.rockler.com/product.cfm?page=16972&filter=12%22%20Table%20Saw% 20Dust%20Hood
P.S. 2021 update https://www.rockler.com/table-saw-ho...4-x-2-1-2-high
like this one at Penn states:
http://www.pennstateind.com/store/dt2.html
or Rockler:
http://www.rockler.com/product.cfm?page=16972&filter=12%22%20Table%20Saw% 20Dust%20Hood
P.S. 2021 update https://www.rockler.com/table-saw-ho...4-x-2-1-2-high
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