Looking at getting a Passport Plus to add to the race team. I was looking over the owners manual and didn't see anywhere on how to fill internal bottle. Can you fill them when you hook up external or do you have to take them to the LWS? Can you get extra bottles to have on hand in the pit cart or do you have to carry bigger external to keep filling? How long whould a internal bottle last under (normal) HAHAHAHA welding conditions? Thanks

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