The Amico Oxygen Flowmeter FMO-15U-M4, 0-15 LPM 1/4″ MNPT, USA Color Code has a small and light brass body. The thorpe style flowmeter has a white background making it easy to read, comes with a “D” shaped knob, and has color coded tube and labeling. The flowmeter also features an inlet filter as well as an inlet extension.