Our Welding, Medical and Compressed Gas Regulator Gauges come in 2-1/2", 2", 1-1/2" and 50mm sizes, to meet all your compressed gas needs.  Cleanliness for all gauges in in accordance with Level IV of ASME B40.1, and all low pressure gauges are UL 252A registered and high pressure gauges are UL 404 approved.  Case materials include polished brass, gold or black painted steel, chrome plated steel, and chrome plated ABS.