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Correct. It does not matter if you put the flange inside or outside the tank as long as you put the gasket next to the flange.
Always install the gasket dry with no sealants or lubricants which can cause it to squeeze out and leak. Never over tighten a bulkhead, hand tight plus a quarter to half turn is sufficient. Do not support the weigt of piping or pumps on a horizontal bulkhead. This causes unequal stress on the gasket and it can leak.
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