04-04-2005, 09:57 AM
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Deity
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Join Date: Apr 2004
Location: Sharon, PA, USA.
Posts: 2,211
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The outside of the tank is only a sheetmetal covering. Under that is an insulation layer that is typically 1" or more surrounding the steel pressure vessel. Securing the draft would would only require sheet metal screws long enough to pass through the two layers of sheet metal. A small #8 x 1/4" or 1/2" sheet metal screw would more than sufficient, yet pose no threat to the pressure vessel.
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