26M ThruHull Question

[Hamin' X]

Interesting.

Makes sense. I had a lawn irrigation shutoff valve freeze and burst because the blow out company didn't open one of those and drain it. Froze and cracked. Same principle.

On the valves that don’t have the drain plug, leave the handle at 45 degrees. Not on, or off.

~Rich

[adudinsk]

Yes, I am leaning to replacing the entire unit to brass as in the photo.
As well, I will install a valve on the motor well drain, and as far as the sink goes,
one of 2 options;
1) Diverter valve / valve etc so it can be isolated (plastic)
2) a small tank (home made fiberglass or possibly a shower sump/drain tank) and a pump to another thru hull way above the waterline.
(don't think i will be dipping the rails into the water..)
#2 is my long term goal so I can always pump it out easy.

Sink/Motor well drain plastic... thru hull brass (with anti freeze plug)

Thanks for all the great info

AD!

[adudinsk]

Ordered a Marelon Seacock,
3/4" hose ID
mushroom outlet!

in wait mode now..

[adudinsk]

got my seacock, Forespar/ Marelon unit.
Just wondering if anyone knows what the Transom thickness is?

AD

[Jimmyt]

I know how thick it is right there...

[kurz]

2) a small tank (home made fiberglass or possibly a shower sump/drain tank) and a pump to another thru hull way above the waterline.
(don't think i will be dipping the rails into the water..)
#2 is my long term goal so I can always pump it out easy.

Actually as a paranoid I also think about a pump out of the gallay and the motor well.
Does anybody knows what will happen if the a shower sump will freeze in the winter? Will it get destroyed?

[adudinsk]

THANKS!! Great info!!!


AD

[adudinsk]

As for the pump, from what I read considering my purchase/upgrade (whatever..), Yes.. most all will freeze, and burst.
So you need to run some antifreeze through.. or blow it all out with compressed air.

As far as the "box" is concerned.. no.. it should be fine.. just take the pump out.. blow it out..etc.
Or put a pile of RV antifreeze in the entire unit and pump some through.

I was actually thinking of making a "box" sloping towards the pump.. so it will pump out as much water as possible.. out of fiberglass so I can get a very "custom" fit in the sink area.

Would use a small (cheap-o) automatic bilge pump with 1 hose in, 1 hose out to a vented loop to a thru-hull way above water line.
Fiberglass is not really waterproof.. but I do not really intend on gel coating it.. maybe some PlastiDip on the outside .. (play it by ear)
If'n and When I get the project done, I will post build photos.

Thanks again for all the photos and great help!

Andrew

[Jimmyt]

During my inspection, I was told the thruhull on my boat WAS (and is) below the water line and needed a SeaCock.
I am looking at putting in a brass one, but my boat is "cocooned up" for the winter,
I am wondering what size a stock one is (1"?)
My plan is to seacock the thruhull and put a valve on the motor well drain so I can seal up all the water entry points in case of emergency..etc.

Also.. has anyone modified the sink drain to use a pump and its on above waterline thruhull?
(comments.. worth it.. not.. use sink for storage instead...etc)

Regards
AD

The valve under the motorwell drain is going to need a thru-hull or other method to mount the valve. This is what you're dealing with.

[adudinsk]

LOL.. Hmmm.. maybe drill that out too.. and put another fitting..
But technically .. its Not underwater..


AD

[BOAT]

etc.

Also.. has anyone modified the sink drain to use a pump and its on above waterline thruhull?
(comments.. worth it.. not.. use sink for storage instead...etc)

Regards
AD

I have a sump pump - it's deeper and narrower than the stock sump pumps so it works better and can take a lot of water and also a lot of heeling without the water reaching the top of the tank:

It sits in the lowest part of the boat inside the dinette - there is an outlet near the top of the tank for draining my shower pan you can see circles in red in this picture:

This is the waterline plan view with the location of the sump pump in the red circle:

So as you can see the sump pump is well below the waterline and also well below all water fixtures including my shower pan which sits on the cabin sole when in use. The sump pump is easy to access behind a soft panel here in the dinette:

All the water from this sump is pumped to a thru hull that is already installed by the factory to accomodate a starboard side steering linkage. Since this thru hull is well above the waterline no restrictions are on it's use for anything you want:

The way it works is that everything sent to the sump gets pumped to this thru hull and all flows into the motor well to drain out the factory sink drain. If for some reason your factory thru hull sink drain fails or a restriction does not allow you to drain (like the restrictions I encounter in Avalon) you just put a rubber stopper into the thru hull on the transom. No water will come out or go in but your sump pump will still work - it will just keep filling the motor well until it overflows and drains over the transom. (I can take several showers without overflowing the motor well if I need to store that grey water till I get out of the harbor). Your sink will also back up into the motor well when you put the rubber plug in the hole on the transom.

[adudinsk]

Very Cool!
I like the idea that you pump out into the motor well (above water line) and let the factory drain work!
NICE install job.
So with this setup, you just take a shower in the cabin and it drains through the passage in the 2nd photo..
Pump then sends it to the motor well..
Great Idea!


..I also noticed your flooring.. is that the EVA roll out teak looking stuff?
How do you like it?
Is it self sticking?

I have no carpets.. and think without something, I will have to keep picking my wife up off a slippery floor...(over and over.. )



AD

[BOAT]

It is teak and holly wood panel for cabin soles. I don't know the technical name - maybe Kevin knows - I think he has it too but it's really common cabin sole wood in bigger sailboats. I think there is a post with pictures here - (if I can find the link)

[adudinsk]

Wow.. so it IS real wood (or a wood product) not the EVA foam stuff.

Did you glue it down, or sticky tape, or just set down as is?

AD

[BOAT]

It's a screw down thing - I think in the big boats they glue it down (?) not really sure - Like I said Kevin would know how it's installed normally - all I know is that it's the wood they use for the cabin sole in boats. I do not screw down the galley area because - well this link would be easier than me trying to explain it. I found the link - I stopped posting about it because people did not like how ugly my shower curtain was. I never thought about that aspect so I will remake another shower curtain with pretty flowers and maybe some fish pictures on it to make people happy:

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