One type of Bag Filter Housings. There is only one filter bag inside.The cylinder is made of φ219*3mm seamless steel pipe.The lid is cast and looks like a turtle. Compared to Type1 and 2,Its lid directly presses on the ring of the filter bag, matched with a plastic ring, it can get the best sealing effect.Its operation is simpler and can be used for longer time , because it does not need additional pressure plate.