Smith Equipment purging nitrogen regulator # 30-450-580 HVAC/R Nitrogen Test & Purge Regulator 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. Economical and accurate Solid brass body provide durability Large durable nylon adjusting knob for easy pressure adjustment 2" polished brass gauges - 10psi increments on low pressure gauge Outlet Connection: 7/16" - 20 External Flair Fitting NO HOSE INCLUDED 1 Year warrantyStock Number Gas Used Delivery Pressure Max Inlet Pressure 30-450-580Nitrogen Helium0-450 PSIG 3000 KPa3000 PSIG