Marelon Monroe

Nope that I have your attention, let me say that seacocks are serious business.  Anytime you are drilling a hole through to the cold deep ocean, you want to be following the rules, regs, and suggestions of the pros.

There is to be only one thru-hull on this project, which will serve as a drain for the sink and fridge.  With it right below the kitchen island, I needed to get this sorted before getting too carried away.  Here is the technique I used for installing one of the Marelon Flowtech versions that is totally flush to the outside hull when closed.

Step 1.  Core out a 5" Diameter circle

Step2.  Backfill with a G10 plug and goo, including milled fiber.

Step3.  Glass in place and add a G10 donut, leaving a 1/4" of the valve protruding outside the hull.

Step 4. Time for the hole saw and some 5200.  Follow with a couple layers of carbon over the Marelon flange.