Measuring 6″ in diameter by a length of 20″, the X01 Filter Bag has 2 square feet of surface area (0.186 square meters), making it equivalent to a standard #1 size bag. The X01 is fitted with the patented Polyloc® Ring that seals directly against the wall of the filter housing and eliminates the chance of fluid by-pass. A heavy-duty Polypropylene Restrainer Basket supports the X01.