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Questions about holes?

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Caribbean Soul
Deckhand

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USA
19 Posts

Initially Posted - 05/12/2020 : 10:25:13

Hi friends,

I have a couple of questions about holes that can take in water and I am risking sounding like a complete IDIOT.

1) why would anyone ever open the thru-hull valves? I cannot find an answer to this! Wont water come in and sink my boat? If I always keep them closed wont everything (sinks, toilets) go to the holding tank until I drain it? Why/when do you open your thru-hull valves?

2) what the heck are these two holes/drains for? https://www.youtube.com/watch?v=x1rZY4u0P1A

Caribbean Soul - Ithaca NY - C25 - 1983 - SR/FK - Traditional layout - #3429 - She's Fixin' a Boat - Help!! :)

JoeRobertJr
1st Mate

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25 Posts

Response Posted - 05/12/2020 : 12:05:58

Hi, Caribbean Soul,

On mine, that hole in the transom is for the charging cable from outboard to boat battery.

Mine has no hole in the cockpit like yours. My guess is there was a display there, and the holes were for the wiring.

Regards,
Joe R.

keats
Navigator

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USA
215 Posts

Response Posted - 05/12/2020 : 12:25:02

The through hull valves are necessary parts of your plumbing system, for drawing in flush water for the head, and for draining the sinks and icebox.

Provided your plumbing is sound and intact, it's safe to open them when they are going to be used and you are on the boat.

While you are sailing and heeling, close them to prevent water from backwashing into the sinks and icebox.

When you are away from the boat, keep them closed for safety, that way you aren't renting on hoses and clamps.

Ice lasts much longer in the box with the galley through hull closed.

That cockpit hose is a mod done by somebody. Your boat may have (have had) a pressurized water system. Look for a pump somewhere, maybe by the freshwater tank.

You should close up any holes you don't want. In an earlier post, the holes in the cockpit well looked to be from an outboard remote control. Maybe the smaller holes are related to that or an autopilot.

Good luck and sail soon, ready or not!

Tim Keating
1985 C-25 TR/FK #4940
Midsummer
Lake Don Pedro, CA

Edited by - keats on 05/12/2020 15:27:52

islander
Master Marine Consultant

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USA
3992 Posts

Response Posted - 05/12/2020 : 12:25:17

Looks like what's left of an aft shower or wash down system a previous owner had installed.

quote:
Wont water come in and sink my boat?

No. Water seeks its own level. In other words water will come in through the thru hull and up the hose and stop at the same level as the water is outside the boat (your water line). Think of a straw in a glass of water. The water fills the straw to the same level as the water is in the glass. It doesn't shoot out the top of the straw. The only time it would sink your boat is if the hose or thru hull developed a leak below the waterline. Then the water would try to seek its own level by filling your entire boat up to the water line and as your boat sinks lower the waterline gets higher until[.......

It gets to ugly to continue.
P.S all boats want to sink. Its your job to prevent that.

Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound

Edited by - islander on 05/12/2020 14:16:23

islander
Master Marine Consultant

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USA
3992 Posts

Response Posted - 05/13/2020 : 06:19:35

Looking at the video I would guess that the 1/2" clear tubing is part of an aft shower/wash down the PO had that ends up coiled in the dry compartment. It might still be spliced into the water line that runs to the sink back by the steps.
The black wire might still be or was connected to the battery and and is or was part of the electric start/charging system for an outboard. That wire might have run out to the outboard through that Thru hull in the transom. The hole in the side of the cockpit is more of a mystery. Possibly where there were engine controls at one time? The cables could have run out that Thru hull also. Not sure on that.

Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound

Edited by - islander on 05/13/2020 06:21:52

Caribbean Soul
Deckhand

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USA
19 Posts

Response Posted - 05/13/2020 : 06:31:53

This is all very helpful and much appreciated. Best forum ever.

Caribbean Soul - Ithaca NY - C25 - 1983 - SR/FK - Traditional layout - #3429 - She's Fixin' a Boat - Help!! :)

Steve Milby
Past Commodore

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USA
5851 Posts

Response Posted - 05/13/2020 : 06:50:42

I wouldn't plug the hole in the transom. If you don't need to use it, a subsequent owner might.

As for the hole in the cockpit, you have a choice. You can either make it a big, labor-intensive project to fill it, sand it smooth and re-finish it, or you can make a couple hours project of it and spend more of your time sailing and enjoying the boat. The quick, easy solution is to cover the hole with a small piece of starboard, which is sold at Westmarine. It's a little pricey, but you only need a small piece. You can cut it in a round or square shape and cover the hole. I covered a 4" round hole on my Cal 25 with starboard where an instrument used to be, and it's a neat and orderly repair and keeps the weather out.

Steve Milby J/24 "Captiva Wind"
previously C&C 35, Cal 25, C25 TR/FK, C22
Past Commodore

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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.