These ISO LF Large Flange Plastic Cap Protectors are for ISO63 LF63 NW63 Large Fittings and Flanges.. Please see below in our “Related” section for additional accessories that may benefit your vacuum applications and maintenance needs. We offer a large variety of vacuum pumps, chambers, fittings, hoses, gauges, sensors/transducers, repair kits, oil, filters and accessories for all your vacuum needs.