Where do the sink drains go to?

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Dave

I have a 1978 Catalina 30. The head sink does not drain very well, and when I follow the sink drain tubing/hose, it appears to go eventually under the counter in the galley, to a location behind my Yanmar engine where I can't see it very well. Perhaps it tees up with the drain hose from the galley sink? And then where does it go to? It looks like there might be a valve and a through-hull?? I thought it simply drained into the bilge. If there's really a through-hull valve there for the sink drain, it's presumably been open for about 28 years... If this is really the case, I'd like to replace it or close it off completely, but it doesn't seem like there's any way to access it without major surgery to the galley... Can anyone comment on any of this? Thanks.
 
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Rob 1981 Cat 3019642

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Jun 16, 2004
130
Catalina 30 Mk1 Horseshoe Bay, BC
on mine...

the head sink drains into the thru-hull thats in the head area behind a small door near your feet. You should see a T there. The thru-hull is the inlet for the head and the outlet for the head sink. And it always drains slow on mine too. The line you are probably following is the fresh water line to the sink from the water tank. Maybe? Also, to check the galley sink drain, open the doors under the sink, follow the line down as far as you can. Then go around into the engine compartment and try to follow it down further. Use a flashlight. My galley sink drain thru-hull is directly under the sink. I have an inspection port on the galley side to access it. It is very hard to find, it is right next to the muffler. That's how I find it, I feel for the muffler and then feel the thru-hull. Good luck! Rob
 
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