Which color hose indicates acetylene gas?

• A. Red
• B. Green
• C. Blue
• D. Yellow

Answer: (A)

In gas-handling safety, hoses are color-coded to show what gas they carry, so you can’t mix up lines during setup. Acetylene hoses are red, which helps you quickly identify the gas and use the correct regulators and fittings. This color cue is crucial because acetylene is highly flammable and has special handling requirements, so mixing it up with oxygen or other gases can create serious hazards. For reference, green usually indicates oxygen, blue is often used for inert or shielding gases, and yellow is commonly used for other fuel gases. Knowing that red signals acetylene helps keep welding and heating operations safer by preventing incorrect connections.