Easy Installation of lightweight M6TW and M66 using pipestand mount with no additional support required.Available as 3 valve equalizer or 5 valve gas pattern assemblies.Upstream or downstream 1/4" FNPT ports for connecting the static pressure to the meter.Hard or field-replaceable soft seats for bubble-tight performance in abrasive applications.Bonnet-to-body and stem threads isolated from process corrosion - important in sour gas applications.Stem backout prevention eliminates accidental removal while under pressure.FKM O-ring with PTFE back-up ring standard stem packing with long life assured by mirror finish stem in the packing area.Integral hard back seat forms a secondary seal for the stem threads when valve is fully opened.Rolled stem threads increase strength and extend life.