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[kokopelli]

Those are very good for "stuck" fill/drain plugs. I've used them for years on stripped screw hears on bikes.. I need to get another.. Ron

JoeUser previously said:

I usually carry a 'true' impact wrench; one you hit with a hammer (doesn't require any air or electricity, just good old-fashioned muscle).

I'll see if I can find a picture of one and post it up, for those of you that don't have on-board air or want to use an electric one...

EDIT: Here ya go: 1/2" Impact Tool: Northern Auto Tools