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Old 13-11-2008, 15:28   #1
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Galley Sink Drain

Is the preferred drain as in the attached photo? Those thru hull fittings are quite expensive. I know they are the best but are there alternatives?
Kind regards,
JohnL
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Old 13-11-2008, 15:47   #2
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Hi John:

I am no expert but that is the way mine is set up.
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Old 13-11-2008, 17:20   #3
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Where is the waterline?
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Old 13-11-2008, 17:23   #4
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That's now my setup for both galley & head - simple, simple!
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Old 13-11-2008, 17:34   #5
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Quote:
Originally Posted by Charlie View Post
Hi John:

I am no expert but that is the way mine is set up.
Mine too! But with dual sinks with a "Y" fitting.

My waterline is about half way up the drain.
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Old 13-11-2008, 17:53   #6
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mine is the same EXCEPT, it is above the waterline
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Old 13-11-2008, 18:52   #7
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Hi John,

Do your plumbing within the boat so that more than 1 items drains through a single seacock. If you use a vertical tree approach above the seacock you can blend several drains into a single thru hull fitting. If the vertical section rises above the water line you're able to put a removable top on it so that it can be inspected, cleaned or unplugged if required. Idealy, you can arrange all of your intakes to one through hull and all of your drains through a second.

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Old 13-11-2008, 20:51   #8
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Is the preferred drain as in the attached photo? Those thru hull fittings are quite expensive. I know they are the best but are there alternatives?
Kind regards,
JohnL
What kind of alternative are you looking for?

If you put a hole below the water line of the boat, you need a first class valve on it. There really is not an alternative. Your sink might be above the waterline, but I know of no boats where the drain leaves the hull above the waterline. Not to say it is impossible, but it is cetainly rare. If that hose was to fail, or just need replacing or cleaning, you would certainly want to turn off the ocean, wouldn't you? Wouldn't a high quality (i.e. expensive) valve make you feel better?

The only option I can think of is to collect the sink drain in a sump and pump it overboard well above the waterline. Not likely to save much, if any, money, and certianly less reliable that a simple straight pipe. Lots of complications for little benefit, IMO.

Bill
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Old 14-11-2008, 01:35   #9
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Mine was above the static water line...about 6in...it now goes in a grey water tank.
I agree that if it is below the waterline it should have a quality fitting with seacock.
I consider my real water line the gunnels.
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Old 14-11-2008, 13:55   #10
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Thanks for all the good input. Bill and Glen, you've provided me with the information I needed. I wish I had more things to drain into it but there is only the two compartment deep galley sink that drains above the waterline (TG). The head sink is about 18 feet forward of that and too far to drain.
I'll bite the bullet and get some proper seacocks. Probably marelon. Oh well, what's a few more dollars of my retirement money. : )
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JohnL
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Old 14-11-2008, 15:24   #11
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Keep in mind one thing. If your drain runs directly from the sink to the through-hull, anything that can make its way down the sink drain is out of the boat, unless it jambs in the through-hull itself. Adding a trap may be worth thinking about. It can save otherwise expensive errors, like lost rings. Been there, done that!

FWIW...

s/v HyLyte...
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Old 14-11-2008, 16:18   #12
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"Lord of the Lost Rings." Aargh! That's a bad thought with a good idea.
For Pelagic. The bottom of the sink is 15 inches above the (theoretical) water line unloaded. The thru hull would be below the waterline.
Again, thanks everyone for the great input. I may have enough parts and pieces here to put something together without having to fly over to West Marine or drive 100 miles from here to Kona to find boat parts. There is always catalogs but I just hate paying for extra shipping costs.
Regards,
JohnL
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