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The Turbo Torch 0386-0849 NFM-TT Nitrogen Flow Meter provides precision gas flow control for nitrogen-purging applications. Use with any nitrogen-purging regulator equipped with a 7/16" - 20 male flare to outlet to control the flow of nitrogen gas through copper tubing while brazing. Purging copper lines with nitrogen during brazing prevents internal oxidization and scale build-up. Features Outflow of 0 to 75 SCFH (Standard Cubic Feet per Hour) and 0 to 35 LPM (Liters Per Minute) Brass body construction Standard HVAC female flare inlet fitting and male flare outlet fitting Max inlet pressure 50 PSIG Over-pressure safety relief valve Excellent accessory to the Turbo Torch Nitrogen Purge Kit and Nitrogen Purge Regulator.