Transom Scupper Conversion on 23' Seacraft CC

[SeacraftErik]

So I bit the bullet and decided to modify the scupper system on my boat. After a bunch of research I decided to get the Gemlux Duckbill Scupper system. It should hopefully provide the driest or fastest draining scupper system compared to the vertical "straight to the bottom" scupper system that the boat came with. Still not sure how that was a logical design cause when I ran my boat the port side was flooding like a geyser!

Here's a quick writeup to add to the other writeups that members put together. Thanks for the encouragement fellas.

First thing I did was use a screwdriver and hammer to tap out the brass tube thru hulls on both sides of the boat.

Next I used my dremel to sand down gelcoat around the sump of the scupper area and also around the bottom of the hole so that the fiberglass filler and resin/glass had a good material to bond to. Cleaned and acetoned the area.

Next I taped up the bottom holes on the hull so that the fiberglass filler won't fall through. Then I mixed some catalyst and filler and filled the holes. I also raised the sump flush to the drain rails. Doing this would give me a little more height which would equate to higher above the water line scupper exits. After that cured, I lightly sanded it and laid some fiberglass and resin on both the deck side and the bottom. Lightly sand and fair after it has cured.

Then I drilled my 2" holes on the inner liner. Test fit the T-H Marine 2" deck fitting. Slid a long screwdriver through the hole of the fitting and used the point of the screwdriver to mark the area of the transom on where to cut the hole.

That was the trickiest part of this whole installation. I didn't want to drill from the outside of the hull and be wrong on my calculations so I marked it from the inside and thankfully my drill and regular bit fit on the inside and I was able to cut a pilot hole.

Next I carefully taped the hull from the outside and used my holesaw from the outside and cut it perfectly to line up with the deck fitting.

I coated the exposed wood with 5200 to protect it. Next I laid a bead of 5200 around the lip of the gemlux thru hull and asked my son to hold it tight while I screwed on the nut (also with a bead of 5200). Gemlux only requires 15lbs of torque thankfully since the 5200 will also bond it tight. Then the duckbill got put on from the inside along with the 1.5" barbed fitting (also laced with some 5200).

Note: I precut the hose to the correct length and preinstalled it onto the black barbed fitting since the fit was so tight. Also pre started the 2 hose clamps so I didn't have to fumble with it since access is so tight.

Final part is to lay a bead of 5200 around the lip of the deck fitting and also the nut that secures the fitting. A little bit of grease around the barb to slide into the hose easier and tighten the nut. A little tough not being able to see it but got it done.

Lastly tighten up the hose clamps and let the sealant kick.

I still have to gelcoat the scupper area of the deck and put on 2 more backup hose clamps but for the most part the job is done. It was a little stressful but i'm glad I did it.