VN Series HVAC Nitrogen Purging Regulator Flowmeter, 35 to 25 SCFH Purge 3 to 6 SCFH Braze, 5 1 2 in L, CGA 580 ORS NASCO positive ground for roll out welding positive ground for roll out welding of pipe and fittings—eliminates weld pinholes caused by poor grounding Makes up ground leads three ways—lug chemical fluids Heavy weight specifically designed for continuous leaks and larger spills so you use less material Meltblown polypropylene absorbents feature economical Hybrid design—regulator and flowmeter all in one Easy to read nitrogen cylinder content gauge with preset flow rates Heavy duty brass body designed for rugged field use No adaptors needed