Pfeiffer Reducer NW-200 to NW-250 Vacuum Fittings, ISO-LF Large Flange Size NW200 to NW250, 2.0 in. Long. PN: 320RRG250-200-50

These reducer vacuum fittings follow International Standards Organization (ISO) standards and have a flange size of NW-200 to NW-250. ISO flanged vacuum fittings are commonly used to build process vacuum plumbing and systems for industrial applications. The fittings are quick to assemble using double claw clamps and a centering ring (please see top right figure - click to enlarge). The Viton® centering ring contains a rubber/elastomeric o-ring. The ISO standard sizes for large flanges are NW-63, NW-80, NW-100, NW-160, NW-200, NW-250, NW-320, NW-400, NW-500, NW-630. These vacuum flages are made of corrosive stainless steel.