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post #1 of 16 Old 03-26-2019 Thread Starter
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Gemini 105mc seacock question

I bought a 2006 Gemini 105mc and have a question about the seacocks. I'm trying to figure out the closed position for the AC seacock. The seacock has three positions and according to the manual with the handle vertical the valve should be closed. But with the handle in the vertical position water flows out of the top port. With the handle to the right water flows to the AC. I'm not sure what happens to the left because I didn't disconnect any hoses. I found the part number for the seacock for the engine but it's a different model. I just bought the boat so still learning about it. Thanks
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post #2 of 16 Old 03-26-2019
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Re: Gemini 105mc seacock question

I have a 2005, the A/C seacock is open with the handle pointing straight up. It is closed with the handle turned/pointed to the stern. With the handle turned/pointed to the bow the A/C can be flushed with a hose connected to the top.

You don't happen to need a screecher sail do you ???
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post #3 of 16 Old 03-26-2019 Thread Starter
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On my boat when I turn the valve to the right which is pointed towards the corner of the stern/port water is provided to the AC. The port on the top is not connected to anything. I can't find another hose that's supposed to connect to it. Does this mean on my boat turning the valve to the left will close the valve?
The previous owner installed a separate pump to prime the AC unit. At least that's what it looks like.
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post #4 of 16 Old 03-26-2019
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Re: Gemini 105mc seacock question

Sorry, mixed that up. Yes pointed to stern, open to A/C, pointed straight up closed. Pointed towards bow - open to fitting on top of seacock.

As far as the pump, the A/C pump is mounted on the left side of the water tank.

Last edited by Davy J; 03-26-2019 at 02:27 PM.
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post #5 of 16 Old 03-26-2019
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Re: Gemini 105mc seacock question

Now that I think about the water pump location, a few years ago I replaced mine with a new different model pump. It was originally mounted on the small bulkhead in front of the valve and water tank.
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post #6 of 16 Old 03-26-2019 Thread Starter
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That's the issue with mine. With the valve pointed straight up water comes out of the top port.
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post #7 of 16 Old 03-26-2019
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Re: Gemini 105mc seacock question

Just to make sure we are talking about the same seacock, here is a link to what I have:

https://www.forespar.com/products/bo...lush-out.shtml
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post #8 of 16 Old 03-26-2019 Thread Starter
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That's the same seacock I have for the engine. The seacock for the AC is the same except the top fitting is a barb fitting.
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post #9 of 16 Old 03-26-2019
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Re: Gemini 105mc seacock question

Yes they make a version that has hose barbs on both sides. That's what I have as well. There is a drawing of it on the installation instructions down the page a bit. But the valve should be closed with the handle pointed up.
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post #10 of 16 Old 03-26-2019 Thread Starter
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Maybe I'm looking at this wrong. Let me know if I'm correct. In the up position the seacock will be closed to the sea water but water will pass from one port to the other port. If the valve is rotated to the left or right that corresponding port will be open to the sea water?
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