Medium Duty G Series, Oxygen, CGA 540, 3000 psig inlet no checkout Black oxide spindle resists wear Black oxide spindle resists wear and tear while impeding rust Drop forged arm provides minimal flex under heavy work loads Swivel pad centers on work piece for a sturdy hold Sturdy tommy bar is engineered for durability and comfort single locking Proprietary rustproofing for longer life Commercial grade padlock features superior protection from drilling and prying Choose between Keyed Different (KD) Easy to read high contrast gauges for clarity Color coded knobs indicate gas type Designed for better comfort when adjusting gas pressure High Strength alloy bonnet with nearly twice the yield strength of brass Lower profile regulator with less knob stickout