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| US and ISO gas color codes | ||
| USA | ISO | |
| Oxygen | Green | White |
| Nitrous oxide | Light blue | Light blue |
| Medical air | Yellow | Black and white |
| Suction | White | Yellow |
| Nitrogen | Black | Black |
| Carbon dioxide | Grey | Grey |
| Helium | Brown | Brown |
| Cyclopropane | Orange | Orange |
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