For use with small tanks only, and featuring a 1 1/2"" diameter gauge surrounded by a boot to help prevent accidental damage. Click-in flow control. Two-year limited warranty.Mini-Oxygen Regulator Is Designed With a Lightweight Aluminum Body and All-Brass Pressure Chamber to Provide Excellent Performance and SafetyMedline Oxygen Regulators - 1/2 To 15Lpm, Small Tank Regulator" Case Pack 1