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 Controls the flow of nitrogen gas through copper tubing while brazing Over-pressure safety relief valve Excellent accessory to the Turbo Torch Nitrogen Purge Kit and Nitrogen Purge Regulator