I wouldn't be without one. I've been told you can pop the cover off the air vent (at least there IS one of those!) and use it to fill with a hose. Since there's no way to vent the air then, that might be a bit difficult. Since there is that vent though (unless they did away with that too), I'd think it wouldn't be all that difficult to replace the vent with a fill assembly. Might have to work some plumbing magic, but it should work.
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