Product Description We see a future built on great brands, great products and great people. In every facet of our business we leverage the strengths of our global infrastructure to maximize the benefits of all three. From the Manufacturer These are the Optinal lower plastic collection bags for the Powermatic 1791071, model 75 dust collector. There are two lower bags fro this model. The lage capacity bags help reduce the number of bag changes. Simply dump the bag or replace it when it is full.