O2 Cylinder Colour UK — FRCA Primary MCQ
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Correct answer: E — Black with white shoulders
UK gas cylinder colours: oxygen = black body with white shoulder / nitrous oxide = blue / air = grey with black and white quartered shoulder / carbon dioxide = grey / Entonox = blue with blue and white quartered shoulder / nitrogen = black / helium = brown. The international colour standard has the body and shoulder both white for oxygen.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment