Removal of Cockpit Drain Through Hulls

For Monday, June 22nd, I worked on removal of the cockpit drain through hulls.  Like the other through hulls (sink, head discharge, and raw water intake for head), the cockpit through hulls were glassed in on the interior.  The through hull fitting was being held against the interior of the hull with a large nut, fitted snugly to the hull and with fiberglass laid up around the base.  For the these through hulls there was no in-line ball valve or seacock - just the discharge hose connected to the through hull with a compression clamp.  

I attempted to remove the nut after spraying with lubricant (allowing to sit for awhile), but to no avail.  I decided to just get going with the removal, so I took a reciprocating saw to the threaded piece of the through hull on the interior - cutting just below the nut and tight up against the hull.  Next, I moved to the exterior and used a hole saw to cut through the hull and allowed the through hull to fall out.  I will further clean up the hole, preparing to fill and fair it. 

This is the original through hull removed from Froonie.  You can see that the installation was just the through hull with a nut securing from the interior (see pics below).  There was nothing blocking water intrusion if the hose were to fail, or if corrosion ultimately ate through the threaded portion of the through hull.  I will be patching the holes, filling and fairing, and then re-drilling for proper through hull / seacock installation.  I will also be crossing the the port drain to starboard seacock, and starboard drain to port seacock.

Finally, I sanded the interior patch of the head through hulls, and cleaned with acetone.  I then mixed some neat epoxy, wet out the area, and laid down a layer of 6oz cloth.  Once tacky, I came back with epoxy thickened with West System 407 fairing compound and 404 High-Density filler, and applied a smooth layer.  After inspection for general fairness, I will sand and prep for paint.  I also took the opportunity to further fair the exterior hull portion of the head through hull patch.  It appears that I will be fairing once more , possibly twice, before prepping for bottom paint.