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 Filter Specialists Inc (FSI) part number BNMO400P2P. OEM equivalent filter bags are guaranteed to meet or exceed the specifications of the original manufacturer. The purchase includes a box of 25 filer bags.