A single-handed wrench that holds the main thru-hull housing via the 'wrench flats' on the side of the housing to facilitate tightening of the hull nut. Use wrench 75WR-2 or 75WR-3 for the hull nut.
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![Airmar 75WR-4 Transducer Housing Wrench [75WR-4]](http://www.essentialmarineservices.com/cdn/shop/files/57086XL.jpg?v=1702386923&width=1445)