Hot Max 22067 Oxy-Acetylene Hose, 1/4-Inch by 25-Feet, Grade R High quality rubber hose material for long life in industrial applications All brass standard B fittings (9/16"- 18 UNF) is industry standard fitting size for use with most torches and regulators Red and green twin hose is color coded for safety and easy identification Designed for acetylene and industrial oxygen use only Temperature Range: -40F to +200F (-40C to +93C)