CGA 870 OXYGEN REGULATOR - A compact and light weight oxygen regulator is designed to fit any oxygen tank with a CGA 870 style fitting. Made of lightweight anodized aluminum with brass high pressure conduits. Designed to be used on oxygen tanks up to 2000 PSI. ADJUSTABLE FLOW RATE - Easily adjusts between 12 preset flow settings from 0-25 LPM with a simple turn of the knob. Easy to read indicator shows the current LPM. COMPACT SIZE - The regulator measures approximately 5.5" x 2.5" x 1.25", so it won't make oxygen tanks overly cumbersome by taking up too much space. SINGLE BARB OUTLET - The barb design fits securely into tubing and prevents leaks and detachment. OXYGEN KEY INCLUDED - Includes durable oxygen key (or wrench) that allows you to open portable oxygen cylinders. Comes with a chain that can be attached to the regulator for easy access.