Smith Nitrogen Purge Regulator - HVAC Purging 30 Series Smith's single stage nitrogen regulator is specially designed to meet the specifications of HVAC refrigerant purging applications. This regulator is used with nitrogen to test an HVAC system to locate leaks and to purge an area for installation and repair. Its compact size is suitable for use where space is limited. Features Dependable High Pressure Seat - Sure-Seat technology block debris from entering the high pressure seat for a positive gas tight seal time after time. A copper-nickel filter encases the high pressure seat, protecting it from debris, allowing many years of dependable performance. Improved Diaphragm - constructed of durable reinforced, laminated Neoprene Polycarbonate shatter resistant gauge lenses Auto reset safety relief valve Extremely Accurate - accurate within +/- 2% of actual gauge reading for both.
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