The PP-40-0.45-DOE-B cartridge filter is an absolute rated pleated polypropylene filter, manufactured by Harmsco Filtration. The All-Poly absolute rated pleat is rated at 0.45 micron. This filter has a nominal length of 40″ inches and has a DOE (double open end) End Cap. The filter has a B = Buna gasket. These cartridges are 99.98% efficient (Beta 5000) at their designated micron rating. USP Class VI – 121* C (250*F) for plastics. FDA listed materials: Manufactured from materials which are listed for food contact applications in Title 21 of U.S. Code of Federal Regulations.