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. The Polyloc Ring sits directly against the basket collar for additional bag support.