When you drill a hole for a bulkhead you create angular edges that again from an engineering standpoint are stronger than edges in a chip.
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KEEP CALM AND REEF ON!!
OK, I know I'm splitting hairs here. and mean it warmly... but to make it clear to those who don't know the process and may be thinking about drilling a tank...... actually you grind those angular edge breaks after you drill the holes. ..and sadly plenty of the drilled holes in tanks never get that done to them.



