those darn thru hulls... - SailNet Community

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Old 03-06-2012
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those darn thru hulls...

Upon just a slight tug on the hose connecting to the thru hull on the transom, the middle plastic piece outboard just plopped into the water while the hose with the inboard end attached was in my hand. Apparently, the thru hull was barely on at all when I got the boat, yikes! The middle of the 3 at the stern. Exhaust on the starboard with emergency bilge on the port.
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Old 03-06-2012
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Re: those darn thru hulls...

Have you got any photos of the stuff ?
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Old 03-06-2012
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Re: those darn thru hulls...

How did you keep the water out?? Look for Maine Sail's posts on through hulls... he has some great info for you as it would appear that you are going to replace one.
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Old 03-06-2012
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Re: those darn thru hulls...

i assume it was above the water line?its a good idea to check thruhulls,sinks etc often,i'm amazed that most boat sink drains are made of potmetal,i've personally saw 2 diffent boats sank because the potmetal corroded away,i'm also amazed at why when lots of people who buy a brand new boat have the dealer/broker put in bunches of thru holes
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Old 03-06-2012
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Re: those darn thru hulls...

I am worried about my old bronze thru-hulls on my Columbia 29 but have to sit tight a couple more months. I am hoping to haul out soon and replace the backing plates and toy with bronze thru-hulls a bit and see if they still open...I am afraid the handles may break off but bronze is pretty tough stuff except when it comes to things like valve handles in a shear type of stress or force .. have not tried to open them obviously and left them well enough alone. Let's say all the bronze thru-hulls have a nice greenish patina...well..it's more than a patina...they are just green! Backing plates are all plywood squares that are looking a bit dry-rotty but not a drop of leakage from any of 'em so I just sit and cross my fingers while my C-29 lies at her mooring and my hair grays further until later this spring when I can finally pull her out of the water for a couple months...bottom job, thru-hull inspection/replacement,etc...
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Old 03-06-2012
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Re: those darn thru hulls...

White plastic thru hulls can be swatted off with the heel of the hand . I've done it. UV breaks them down quickly. A friend had the same happen with her cockpit drain in the transom.
Get rid of them. Switch to bronze.
Stainless type 316 ball valves have worked trouble free for me for over 30 years. No problems whatever.
With my steel hulls, simply welding in stainless pipe nipples have eliminated any kind of thru hull, seacock problem for me, and my clients, for many decades. .
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Last edited by Faster; 03-06-2012 at 07:49 PM.
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Old 03-12-2012
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Re: those darn thru hulls...

Gosh, Thank you for the advice! I'm glad to put out there what I've discovered and sure delighted in seeing what comes back!

If that plastic through hull was hit by a following wave, as well as the other one as it becomes degraded from the UV stuff, trouble can sure follow! So, I'm taking your advice and going to have those darn above water line plastic ones replaced with bronze ones after seeing what happens! THANK YOU, AGAIN!
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Old 03-12-2012
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Re: those darn thru hulls...

BTW, the through hull that just fell off didn't even look old or tired. The plastic was deceptively clean and bright white...kind of insidious....
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Re: those darn thru hulls...

Thank you for your reply. The galley sink is pretty rotted. I'll check the drain as well and ask the mechanic for advice. I sure don't want the boat sinking, that's the last thing anyone would want for sure.
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Old 03-12-2012
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Re: those darn thru hulls...

Great advice, thank you!
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