Another Adventure · video

What this video covers

A cored-hull sailboat named Tridium undergoes below-waterline through-hull installation while afloat, a procedure the crew argues is straightforward when executed correctly.0:16 Cored hulls require prep work before drilling: remove the inner laminate layer and all coring material, leaving the outer laminate intact, then bond the two layers together to seal the coring.1:04 The through-hull fitting must be threaded to accept a backing nut and gate valve, and its inner surface gets a thick bead of 3M 5200 or 4000 applied 15–20 minutes before submersion to allow partial air cure.1:46 Stuffing foam inside the fitting prevents water flowing freely through it during installation.2:15 The sequence runs: drill a quarter-inch pilot hole first, have the diver locate it from outside and sand the hull surface, then use a plunger or bowl to limit flow while the full hole-saw cut is made.2:58 A bung or palm covers the finished hole until the diver pushes the pre-coated through-hull inward, a second bead of 5200 goes on the inside flange, and the backing nut and ball valve are torqued down while the diver holds the fitting against spinning.3:39 Done correctly, the diver brings more water into the boat on their body than enters through the installation process.0:25

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