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This Miller-Smith Sure Seat single-stage regulator features filtered seat technology to prevent contamination. It also features a rugged forged body and corrosion-resistant nickel-plated bonnets. Smith’s single stage nitrogen regulator is specially designed to meet the specifications of HVAC refrigerant purging applications. This regulator is designed for use with nitrogen to test HVAC systems to locate leaks and to purge an area for installation or repair. It’s compact size is suitable for use where space is limited. It features a solid brass body for durability a large durable nylon adjusting knob for easy pressure adjustment and 2 highly accurate 5.1cm gauges with shatter resistant lenses. This nitrogen purging regulator is designed for use with nitrogen to test HVAC systems to locate leaks and to purge an area for installation or repair. It’s compact size is suitable for use where space is limited. It features a solid brass body for durability a large durable nylon adjusting knob for easy pressure adjustment and 2 highly accurate 5.1cm gauges with shatter resistant lenses.