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Author Topic:   Transom Scuppers on larger Whalers
David Pendleton posted 06-18-2006 12:55 AM ET (US)   Profile for David Pendleton   Send Email to David Pendleton  
My 23 Conquest has three transom scuppers that are at the end of their useful service life.

I want to replace them myself, but before I pull one out, I'd like to know what I'm getting myself into.

Can anyone describe to me how these things are installed?By that I mean are they held in place (and watertight) simply by the fitting on both sides or are there gobs of silicone involved?

Thanks all.

Mambo Minnow posted 06-18-2006 01:17 PM ET (US)     Profile for Mambo Minnow

I remember a similar discussion and saved this link for future reference on my 99 Conquest 21. My scuppers appear still in good shape.

You should be able to install these with stainless steel screws and some 3M 5200 adhesive to keep the water out.

26Out99 posted 06-18-2006 02:16 PM ET (US)     Profile for 26Out99    

I'm assuming you are talking about the scupper valve assembly. Several different manufacturers including Sea Dog, Perko, and Attwood. Make sure you get the right replacement to match what you have as there are differences in diameter and hole position amongst the different manufacturers.

Mine are 2 part held by 4 screws around the perimeter nylon/plastic and were the factory install. Sandwiched in between is a rubber flapper and gasket. The flapper is to stop backflow. Routine maintenance suggests changing out the flapper every few years so it remains flexible and able to seal the scupper discharge if there is back pressure from water trying to flow back into the boat. No silicone/caulk needed in making this change.

Something to consider if you have nylon/plastic scupper valves is changing them out with stainless. Insurance companies aren't to fond of the plastic thru hulls of any sort. In this case it is a bit more of a job, which would include 5200, etc. to insure there is no chance water can intrude into the transom.

I think it is worth taking the extra time to make the change to stainless fittings if you have plastic thru hulls showing any signs of degrading. Insurance is happier and you'll sleep better!

David Pendleton posted 06-19-2006 11:34 AM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
Mine appear to be Perko.

Both the flapper and nylon ring are seriously degraded from exposure to UV.

It appears that the boatfix site sells these two components; that seems easy enough. I really don't need to replace the "through-hull" portion of the fitting.

Thanks for the help all.


skeepyjack posted 06-21-2006 09:53 PM ET (US)     Profile for skeepyjack  Send Email to skeepyjack     
26Out99, where do you get the stailess steel one?
David Pendleton posted 06-22-2006 04:44 PM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
Good question, I've not seen a stainless steel one either.
26Out99 posted 06-22-2006 07:43 PM ET (US)     Profile for 26Out99    
Orcas products which are OEM on many of the higher end boat manufacturers, including newer Whalers.*Scuppers*SCUP@@

Starting at the bottom of page 1 are the scupper thru hulls.

When I was at the NY Boat Show I noticed how many boat builders were using the products made by Orcas. As a result I changed out all of my plastic slam latches and it really dressed up things, gave extended life over plastic, and in my opinion provides greater durability.

Many sources of supply such as Ebay, Lewis Marine Supply, etc. so hunt for best prices.

skeepyjack posted 06-23-2006 06:47 PM ET (US)     Profile for skeepyjack  Send Email to skeepyjack     
Thanks for the pointer.
David Pendleton posted 06-25-2006 08:07 PM ET (US)     Profile for David Pendleton  Send Email to David Pendleton     
Okay, you've conviced me. I think I'd prefer the stainless also.

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