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Old 02-07-2014, 22:58   #1
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To Thru Hull or not.

Im installing another bilge under the coupling of my beneteau to drain that little leakage that always happens. I was thinking of just putting a T connector and connecting that to the already existent hose. I was told its better to make another thru hull and put a separate hose for that bilge. Apparently if you put a check valve in the T connector the other bilge can't power through it. It hurts to make a hole on a boat, those to words don't go together in a sentence imo. Any advice/recommendations are greatly appreciated.
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Old 02-07-2014, 23:50   #2
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Re: To Thru Hull or not.

How about putting a very small auto bilge pump in your new bilge and direct it's output into the main bilge, to be discharged by the main bilge pump through the existing through hull?

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Old 03-07-2014, 09:44   #3
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Re: To Thru Hull or not.

Installing 2nd Bilge Pump

I posted a similar topic, with the exact same concern for more holes in the boat. What I ended up doing was installing a check valve above the bilge, larger diameter hosing, and a larger outlet (so widening an existing thru-hull) for my cockpit drains. The automatic secondary pump routes into this system, and not that of my existing manual pump.

I don't recommend this for a long-term solution, and am convinced that I will drill another hole should long distance cruising become an option. The installation was for my coastal day-sailing and marina regulations piece-of-mind.
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Old 03-07-2014, 14:13   #4
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Re: To Thru Hull or not.

Quote:
Originally Posted by Toothless View Post
...What I ended up doing was installing a check valve above the bilge, larger diameter hosing, and a larger outlet (so widening an existing thru-hull) for my cockpit drains...
Never install a check valve in any bilge pump line. And never share a bilge pump discharge line.
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Old 03-07-2014, 22:11   #5
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Re: To Thru Hull or not.

Should i drill the tru hull from the outside of the hull inwards? Or from the exterior to the inside? Cheers for the info.
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Old 03-07-2014, 23:19   #6
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Re: To Thru Hull or not.

I'm with Terra Nova, avoid check valves in bilge pump discharge lines and don't share a discharge line.

I think people are too afraid to put holes in their boat. If it is done correctly, there is almost no chance of a problem. In your case you're looking at a 3/4" thru-hull for a small bilge pump. Mount the thru-hull where water can't flow back in even heeled (transom?) or if you can't do that, put a vented loop in the hose higher than the heeled waterline.

I'd drill a pilot hole through from either direction where you want the thru-hull, then use a hole saw to cut part way through from the outside, then the rest of the way from the inside. This just makes a little neater hole.

There is no rule that says you can't install a seacock on a bilge discharge if it worries you.
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