Series FIS/HP sight flow indicators, provided with NPT threaded ends per ANSI B2.1, offers inline on-the-spot viewing of a pipeline's contents. Series FIS/HP may be configured with flapper, drip tube or rotary flow indicators. Options include socket weld and silver brazing connections and double window assemblies. Rating: HP3 - 300 PSIG (20.7 Barg), HP6 - 600 PSIG (41.4 Barg). Full ANSI pressure Class 300 and 600 rating available.