Nylon monofilament mesh filter bags woven from single-fiber threads with square and uniform openings offer low-cost surface filtration, excellent strength, and good removal efficiencies of non-deformable contaminants with temperature ratings of up to 350 deg F. Handles are standard on all bags. F Flange replaces Pall FSI PolyLoc. This is a direct replacement for American Meltblown part number NMO400A2F. OEM equivalent filter bags are guaranteed to meet or exceed the specifications of the original manufacturer. The purchase includes one box of 25 filer bags.