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Old 13-04-2014, 10:25   #1
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Scuppers exit at waterline - no seacock

Need some sensible advice here.
On my 1977 tartan 34C there are two scuppers attached to two 1 1/2" ID hoses that each leads to a glassed-in thru-hull that exists just above the waterline at the stern below the transom. There are no seacocks (see photo) and the glassed-in thru-hulls seem strong. But in a following sea or when motoring the the stern submerges so that the thru-hulls are below the waterline.

Is this a big safety concern for offshore sailing? What is the minimum that should be addressed and what would be ideal?
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Old 13-04-2014, 10:31   #2
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Re: Scuppers exit at waterline - no seacock

Looks pretty good to me. The question is if you put in a valve, with the extra clamps, joints, fittings, will it increase the odds of failure or make them better? You could just add a good gate valve or ball valve on each one. That'll last 10 years or so... I'd leave it as is probably.

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Old 13-04-2014, 10:32   #3
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Re: Scuppers exit at waterline - no seacock

Not uncommon on boats of that era (not just Tartans). Ideal would be a proper seacock. Short of that maybe an inline valve and a good supply of pine plugs.

It is double clamped, which is good.
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Old 13-04-2014, 10:41   #4
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Re: Scuppers exit at waterline - no seacock

Ideally, there is a seacock on each T-hull that can be submerged.

The problem with your setup is how easily a stored item might fall against and break or dislodge the hose. While the outlet may be submerged, as long as the the upper end of the integral f'glass tube is above the WL, it is OK.
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Old 13-04-2014, 10:50   #5
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Re: Scuppers exit at waterline - no seacock

I agree that simple is good. Not much to leak here and strong.

If this were to somehow leak, it's unlikely to be the fitting but the hose. If it's the hose, you'll probably do a temporary repair with tape (or better a slit piece of larger hose clamped over the leak) since you don't want your scupper's closed offshore.

If the hose is over 10 years old or starting to crack, replacing it is better insurance than a sea cock.
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Old 13-04-2014, 15:01   #6
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Re: Scuppers exit at waterline - no seacock

I had something similar, except there was a thru hull made of marelon. I replaced both with real groco thru hulls with valve.

I would agree with replacing the hose.
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Old 13-04-2014, 15:57   #7
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Re: Scuppers exit at waterline - no seacock

we have 3 deck scuppers each side just like this. Inspect and make sure all is sound & clamps are in good repair. You might hang soft wood plugs at the ready.

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