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Old 27-02-2009, 12:45   #1
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Drains

My galley sink drains outside via a thru hull fitting located about 4 inches below the water line. I'm not a fan of thru hulls below the water line and am looking at moving it up to just above the water line. Any input on this? Sink should still drain, and fitting failure shouldn't sink the boat then. Thinking I can run bilge pump to same thru hull via T and save adding another hole in the hull.
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Old 27-02-2009, 13:46   #2
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First thing to do would be to make sure that your sink bottom is above the waterline, and by how much..This will determine how far above the waterline you can go with the thru hull. But to be quite frank, I think that you will find that the sink bottom is already below the waterline. I had a26 ft Commodore that was set up like that..unable to modify the sink drain location.
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Old 27-02-2009, 14:41   #3
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First thing to do would be to make sure that your sink bottom is above the waterline, and by how much..This will determine how far above the waterline you can go with the thru hull. But to be quite frank, I think that you will find that the sink bottom is already below the waterline. I had a26 ft Commodore that was set up like that..unable to modify the sink drain location.
Whooops,

Say, if the sink bottom is below the waterline,and it is plumbed to a throughull below the w/l, seems like there would always be water in the sink... right up to the w/l.

I doubt if this is the case!

Cheers,

Jim and Ann s/v Insatiable II
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Old 27-02-2009, 16:47   #4
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Waterline

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Old 27-02-2009, 18:01   #5
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I personally hate underwater thru-hulls as well (removed 7, stuck with 3, but heavy duty Groco, perfectly installed ).
One way to do it would be to have a sump, which you would have pump out regularly (perhaps with automatic electric pump). The downside of this is the stinky sump. You would have to clean the also fairly regularly, since food and all the gunk that does down the sink drain would leave offspring in your sump tank. I thought about it but on our boat, we also use the sink drain as one of the cockpit drains, so it seemed more advantageous to keep it.
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Old 27-02-2009, 19:12   #6
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My galley sink drains outside via a thru hull fitting located about 4 inches below the water line. I'm not a fan of thru hulls below the water line and am looking at moving it up to just above the water line. Any input on this? Sink should still drain, and fitting failure shouldn't sink the boat then. Thinking I can run bilge pump to same thru hull via T and save adding another hole in the hull.
Which side is it on? If you tack one way it'll be out of the water. If you tack the other way it'll still be in the water, even if it is 4" above the water line. Or do you have a powerboat?

Thruhulls are just fine as long as they are installed and maintained properly. If not, then you should worry about all of them.
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