If you want an OP machine with the capability of hooking up a sawdust catcher, then you might want to consider the Oreck LowBoy, or LB as I think they now call it. Go to http://www.oreckcommercial.com, select "Products": then select: "orbital floor machines and burnishers". I can get you one of these somewhat discounted below the Oreck direct price. They sell it with a mechanism that allows it to be hooked up with a backpack vacuum.