Which statement correctly pairs oxygen with its color and threading?

Which statement correctly pairs oxygen with its color and threading?

• A. Green color with right-hand thread
• B. Green color with left-hand thread
• C. Green color with no specified thread
• D. Red color with right-hand thread

Answer: (A)

Gas cylinder identification relies on color coding and connector threading to prevent dangerous mix-ups. Oxygen is identified by a green color, and its valve outlet uses a right-hand thread. This standard pairing lets you safely connect oxygen equipment and reduces the chance of plugging into the wrong gas line. The green color distinguishes it from other gases, which may use different colors, and the threading direction is chosen to match compatible regulators and hoses. Some other gases use different color and thread combinations to further prevent misconnection, so matching green with a right-hand thread is the correct pairing for oxygen.

Gas cylinder identification relies on color coding and connector threading to prevent dangerous mix-ups. Oxygen is identified by a green color, and its valve outlet uses a right-hand thread. This standard pairing lets you safely connect oxygen equipment and reduces the chance of plugging into the wrong gas line. The green color distinguishes it from other gases, which may use different colors, and the threading direction is chosen to match compatible regulators and hoses. Some other gases use different color and thread combinations to further prevent misconnection, so matching green with a right-hand thread is the correct pairing for oxygen.