I`d expect there are 2 components. First, a thru hull fitting of 2 parts where one part screws into the other part, with the hull and some kind of internal backing pad in between. The actual opening/closing valve would screw onto the fitted thru hull.
Not sure about the cutlass bearing but one sounds right.
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BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
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