chemtron oxygen regulators are listed by underwriters laboratories are certified by the canadian standards association and comply with federal specification kkk-a-1822 for ambulances. the 32-26-2070 compact regulator is designed to be lightweight and to take up minimal space when used with portable oxygen cylinders. it has an adjustable flow rate from 2 to 15 lpm and a contents gauge that is accurate to 4000psi. its chrome-nickel plated brass construction makes this unit extremely durable and should provide maximum longevity and peak performance.. Sold by: EA