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|  bulkheads and diameters and stuffs Hey guys, hopefully someone knows what I'm talking about here and can help. If you have a hole drilled in a tank for the overflow and its 3 inches in diameter, is there any way to tell: 1. how big of a bulkhead you need (ie. is it just a 3 inch bulkhead?) 2. what diameter your overflow piping will be? (are you stuck with whatever a 3 inch bulkhead offers? 
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