The Amico Oxygen Flowmeter FMO-04U-OX-D, 0-4 LPM Oxequip, USA Color Code is dial style and has an anodized aluminum body. The flowmeter’s smallest increment 0 LPM. The labeling is USA color coded based on gas type. Flowmeter has an easy to read window for selected LPM. Amico Flow Range: 0-4 LPM Connection Type: Oxequip PSI:50 PSI Flowmeter Options:Dial