Thru hull fitting on side of boat??

They hull fitting below waterline on side of boat

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Fishfried
Posts: 89
Joined: 06 Feb 2019, 16:54
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Thru hull fitting on side of boat??

Post by Fishfried »

I’m considering putting the livewell drain in the side of the boat below waterline about 4” above the bottom of the boat. My concern is the possibility of hitting a stump or rock and having it crack or break. The reason for having it 6’ from the transom on the side of the boat is just to not have to run the drain line 6’ to the transom. What are your thoughts?
I’m pointing to where the thru hull fitting with my tape measure.
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Weldorthemagnificent
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Re: Thru hull fitting on side of boat??

Post by Weldorthemagnificent »

Use a stainless fitting. Attwood makes em, they are low profile and unlikely to snag on said stump or rock.

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Fishfried
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Joined: 06 Feb 2019, 16:54
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Thru hull fitting on side of boat??

Post by Fishfried »

Ok, I’ll look for one. Thanks!

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Scott F
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Location: Joliet, IL

Thru hull fitting on side of boat??

Post by Scott F »

I’d use plastic. Even though there is a greater chance of it cracking than a stainless one would, a stainless fitting would react with the aluminum hull and have a greater chance of leaking where it corrodes the aluminum.

MrGiggles
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Location: Springfield, MO

Thru hull fitting on side of boat??

Post by MrGiggles »

I did that on a 14' Alumacraft.

The livewell was just ahead of the middle bench, and I did not want a big hole in the transom, or another hose running the length of the boat.

I used a bronze thru-hull, with a brass ball valve right after, in the event of a plastic fitting failure (or you wanted to use the livewell as a cooler or dry storage), you could prevent lake water from entering. I did not want any plastic after the valve for the reason you mentioned.

There is only one brand of plastic fitting I know of that is approved for below the water line, which is Marelon. I still don't know if I trust them.

Both bronze and stainless are reactive with aluminum, but it's really only a big issue in saltwater.

I was confident that it would take a serious hit to dislodge that heavy 3/4 bronze fitting, a hit that hard would probably damage the hull anyway, fitting or not.

Keep in mind that the livewell will fill through the drain to the outside waterline if the bottom is lower than that.

Fishfried
Posts: 89
Joined: 06 Feb 2019, 16:54
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Thru hull fitting on side of boat??

Post by Fishfried »

I have some plugs that fit a 3/4” thru hull fitting. I’ll have it plugged when not in use, from inside the livewell.
Thanks for all the replies!

Weldorthemagnificent
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Joined: 12 Mar 2017, 12:09
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Re: Thru hull fitting on side of boat??

Post by Weldorthemagnificent »

Use 5200 to seal between the fitting and the hull. Should alleviate any corrosion concerns.

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turbotodd
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Thru hull fitting on side of boat??

Post by turbotodd »

It's done all the time on even factory built boats. Thru-hulls on the side are very common. Mine were all plastic and even I couldn't knock them loose/off/broken and I fished a lake that was FULL of stumps/trees/junk. I mean you can't go 100 foot without hitting one. I think you'll be fine with either one, plastic (actually I think they're PVC but whatever), OR stainless/brass/bronze. Generally they're going to bounce off before anything rips them off, unless it's a sharp enough rock hit just perfect.

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