Hey Rob the tube diameter on mine is 2 1/4" and yeah 1 1/18" shaft. Some are 1 1/4" I put a Lasdrop Gen on there. Not sure I'd recommend it though because the pressure housing has worked its way loose twice letting water in while underway. Josh Muckely has had better luck with is I believe.
-- Rockland Bazemore S/V Blue Pearl C&C 37/40+ Port Washington, NY
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