On Manual Inflatable Life jackets, do I have to blow it up by mouth?

No, manual inflatable life jackets are inflated by pulling the cord with the 'Jerk to Inflate' knob at the bottom of the device. This causes the life jacket to be inflated using a CO2 gas cartridge. All inflatable life jackets do have an oral inflation tube as a backup should you want to inflate it by mouth.

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