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 0-15 Lpm With A Simple Turn Of The Knob. Easy To Read Indicator Shows The Current Lpm Compact Size - The Regulator Measures Approximately 4.5" 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