Below water through hull fitting - O'Day 25

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Raftco

Raftco

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Sep 23, 2009
59
Catalina 30 MKII, Fin Keel Harwich Port, MA
I have a through hull brass or bronze fitting that is directly below the sink in the galley on my O'Day 25. Originally I thought it was a drain for the sink, but if that's the case it will only drain if the boat is moving - which didn't make much sense to me.

Is this a factory item? I was thinking it might be for saltwater intake, but the boat has a porta potti setup so I'm fairly certain it's not for that. The next guess was a saltwater intake to clean the bilge. I believe the boat had an inboard at one time, would the intake be located under the sink for the old engine?

Just trying to figure out if I have any need for this through hull or if I should take it out and re-glass the boat since it is below the waterline.

Thanks!
 
Ross in Tampa

Ross in Tampa

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Jan 11, 2007
294
Columbia 28 Sarasota
That fitting is for the sink and for the icebox. It does or at least should drain while stationary too. Mine does. No need to remove it, but do keep and eye on it. It might be a worthwhile upgrade to replace the factory fitting with a marelon or equivalent seacock. It has been on my to-do list for a while.
 
Sunbird22358

Sunbird22358

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Jun 2, 2004
1,952
Oday Day Sailer Wareham, MA
Is this thru-hull hooked up to anything? How is the sink drain plumbed at the moment?
Most O'DAY 25s that I've seen have a marelon plastic thru-hull at the waterline to drain the galley sink, yours may have been changed or maybe the older models used bronze (It shouldn't be brass, marine fittings are bronze) and had the fitting located lower in the bilge.
I know it wasn't for an intake for a marine head, that thru-hull would have been forward near the head (if boat has always had a porta-potty, there wouldn't have been a thru-hull as you correctly assumed).
 
Raftco

Raftco

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Sep 23, 2009
59
Catalina 30 MKII, Fin Keel Harwich Port, MA
Currently it is not hooked up to anything, the galley needs to be re-built and I'm putting in a new sink. The fitting looks very factory the way it is molded into the boat with the hull.

I suppose it is the sink drain, I just didn't think that the sink would drain with a fitting below the waterline unless the boat was moving.
 
emergpa1

emergpa1

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Oct 2, 2008
1,424
Island Packet 31 Brunswick, Ga
that is curious, I am asking those who might know:how can a sink drain below the waterline? this is where pictures are worth their weight in gold :)
 
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emergpa1

emergpa1

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Oct 2, 2008
1,424
Island Packet 31 Brunswick, Ga
i just bought a whale foot pump for my galley sink. once i have done that install my plumbing should be complete!
 
Sunbird22358

Sunbird22358

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Jun 2, 2004
1,952
Oday Day Sailer Wareham, MA
Water seeks it's own level, as long as the bottom of the sink is above the waterline, it will drain. There will always be water in the hose (unless you shut-off the seacock (or ball-valve) on the thru-hull) as long as the thru-hull is below the waterline, but water will still drain.
 
emergpa1

emergpa1

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Oct 2, 2008
1,424
Island Packet 31 Brunswick, Ga
Sunbird22358 said:
Water seeks it's own level, as long as the bottom of the sink is above the waterline, it will drain. There will always be water in the hose (unless you shut-off the seacock (or ball-valve) on the thru-hull) as long as the thru-hull is below the waterline, but water will still drain.
Click to expand
Makes sennse. That is what I saw in my mind
 
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