The Pen Huo Qi（Chinese: 噴火器; Pinyin: pen huo qi, "spray fire device"） is a double-piston pump naphtha flamethrower used in 919 CE in China, during the Five Dynasties and Ten Kingdoms period.
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The flamethrower was carefully documented and illustrated in the Chinese military manual known as the Wujing Zongyao, compiled in the year 1044 AD during the Song Dynasty.
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