Engineered to draw the dust down from the router bit and deliver to a 4 port for Collection, all while substantially minimizing router noise, this steel Collection box features interchangable panels for optimum dust port and Vent placement. Plug the 2.25″ dust hose from the router fence directly into the dust box’s branch inlet, and let the 4″ port deliver above and below Table dust from the same port. SawStop Downdraft Dust Collection Box for Router Lift. Connects to 4 dust tube. Compatible with all SawStop Router tables. Any assistance or problems? WE WILL MAKE IT RIGHT THE FIRST TIME! We strive to provide excellent customer service for all buyers around the world!