RE: thru hull measurements?
You can measure it any way you want. It depends what diameter you want where. If you want a 1" inside dia thru hull, make sure that's what you buy. A good supplier website like Groco shows drawings that clearly indicate hose ID dimensions, thread dimensions, etc. Groco also makes "full flow" fittings. Make sure you also know if the fitting's threads are NPT or NPS.
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